ARCHI Magazine - Strings and in Italian only
http://www.archi-magazine.it/

BBC Music Magazine
http://www.classical-music.com/

Cicerone Publish
http://ciceronepublish.com/

International Arts Manager
http://www.internationalartsmanager.com/

Musical America
https://www.musicalamerica.com/

Strings Magazine
http://stringsmagazine.com/

Violinist
https://www.violinist.com/

The Strad
https://www.thestrad.com/

The Violin Channel
https://theviolinchannel.com/

Catalogue with all kind of different kinds of music magazines can be found here
http://www.vocalist.org.uk/music_magazines.html

 

Alexanderstreet - Publisher of streaming video, audio, and text library databases that promote research, teaching, and learning across disciplines, including music
https://alexanderstreet.com/

Daniels’ Orchestral Music Online
https://daniels-orchestral.com/

Europeana
https://www.europeana.eu/portal/en

Naxos Music Library 
https://www.naxosmusiclibrary.com/home.asp?rurl=%2Fdefault%2Easp

New York Philharmonic Archive
https://archives.nyphil.org/

Open Music Library
https://openmusiclibrary.org/

The British Library 
https://www.bl.uk/collection-guides/classical-music

 

Antique online piano shop, offering other services as well, including an informational database on (antique) pianos http://antiquepianoshop.com

Online piano shop, with a platform to find all kinds of piano-related services, from finding a specialist or teacher to piano shops
https://www.klaviano.com/

Online distributor for musical instruments, including (digital) pianos (Also has its own brand digital pianos), UK
https://www.chasedirect.co.uk/

Online music/piano supplies shop, Parsonfield, USA, division of Piano World
http://www.pianosupplies.com/

Online music shop, sells different instruments and gear, no acoustic pianos, only digital. Franklin WI, USA
https://www.kraftmusic.com/

Online piano accessories shop, ships only to the continental USA and Canada
http://www.pianoaccessories.com

Online piano shop
http://www.pianoshop.co.uk/

Free

Apps
https://www.mp3juices.cc/ 
https://mymixtapez.com/

Independent music download
https://www.jamendo.com/start

https://www.amazon.com/Free-Songs-Music/b?node=334897011

Also offers the option to buy music and support independent artists
https://www.soundclick.com/default2.cfm?

https://freemusicdownloads.world/

http://freemusicarchive.org/

Daniels’ Orchestral Music Online
https://daniels-orchestral.com/

Free Studio Time - Free Music Production - Free Music Promotion; Artist can submit 4 songs using instrumentals provided
http://nakenterprise.com

Paid

Amazon music

Napster - Both subscription and ‘a la carte’ based

emusic - Subscription based, also free option https://www.emusic.com/

7digital - Offers also audiobooks, soundtracks and more

Bandcamp

Bleep

CD baby - Offers people a place where they can buy and sell their music

Murfie

Play along Orchestra - paying members only
https://playalongorchestra.com/en/tour/

Like Karaoke? Stingray Karaoke is available as video on demand with a selection of hundreds of songs, and as a TV app that offers over 10,000 songs to choose from.
www.stingray.com/products/karaoke

Online scores

Boosey & Hawkes
https://www.boosey.com/shop/

IMSLP
https://imslp.org/

Music Notes
https://www.musicnotes.com/

Various

https://www.cantiga.es/

www.thejuilliardstore.com/list-catalog/type/music

https://www.musicshopeurope.com/

https://www.prestomusic.com/sheet-music

https://www.sheetmusicplus.com/

https://musescore.com

https://www.musicnotes.com

https://www.forsyths.co.uk/music

https://www.reift.ch/

http://www.musictime.ca

https://www.stretta-music.com

http://www.vocalist.org.uk/sheet_music.html

Write your scores online
https://flat.io/

 

Violin Notes
Brainmelody
Android + iOS
https://appadvice.com/app/violin-notes/498399865

Violin Lesson
Tutor AMS music
Android

Learn Violin
Inside.com Inc.
iOS

nTune: Violin Free
iOS

Violin Notes Flash Cards
Apt App
Android + iO

Trala: Learn Violin
Trala:  inc.
iOS
https://tralaapp.com/

Violin Magical Bow
RubyCell
Android + iOS

Fiddle companion
Infinaut Technologies, Inc
iOS

PlayAlong Violin
AtPlayMusic
Android + iOS

Let’s Play Concertos - (Also for Cello, Viola, Clarinet and Flute)
Android + iOS
https://www.letsplayconcertos.com/lets-play-concertos-app

Violin Multi-Tuner 
Martin Britz
iOS

Master Violin Tuner
NETIGEN
Android

How To Play Violin - Ultimate Learning Guide
Manisha Mer iOS

Violin Lessons   
Dog Breeds Apps
Android

Music Tutor Free 
JSplash Apps
Android + iOS

Professional Violin
Alyaka Android

Jameasy Jameasy Inc.
Android + iOS
http://jameasy.com/en/index.html

My Ongaku - Teaching app for violin, licensed by the Suzuki Method
https://www.myongaku.com/

Perfect Piano  - Revontulet Soft Inc.
Android + iOS

Pianist HD: Piano +Rubycell
Android

Piano Maestro JoyTunes
iOS

Simply Piano JoyTunes
Android + iOS
https://www.joytunes.com/simply-piano

 

Speedshifter ABRSM - Practice tool that allows you to change the tempo of audio without changing the pitch
https://gb.abrsm.org/en/exam-support/practice-tools-and-applications/speedshifter/

Sit-ins.com - play along in chamber music ensembles

Yousician Yousician - For guitar + piano
Android + iOS

Tuner apps
iStroboSoft
https://www.petersontuners.com/products/istrobosoft/

Tunable
http://tunable.affinityblue.com/

BOSS Tuner
https://www.boss.info/us/products/boss_tuner_app/

Pano Tuner
http://panoapps.net/

String Tuner 
iOS - EUMLab of Xanin Tech. GmbH

Cleartune
Android + iOS Bitcount Ltd.

InsTuner
iOS EUMLab of Xanin Tech. GmbH

BeatHawk-Portable music production studio BeatHawk-Portable music production studio
iOS UVItouch

Oud HD - (Arabic string instrument) simulator
iOS Apptrax Oud

Kanun HD -(Arabic string instrument) simulator
iOS Apptrax

Echo String TM - Harp app
iOS (only for iPad) Supertintin Co., Ltd

SessionsBand Ukelele Band 1 -Chord based audio-loop app
iOS UK Music Apps Ltd

Dustry String D550 Dulcimer
iOS Michael Eskin

Trapezoid - Hammered Dulcimer simulator
iOS - Michael Eskin

Aleph Looper - Studio/Looper app
iOS (only for iPhone)
Secret Base Design

Strng-String synthesiser app
iOS -  Erik Sigth

forScore - Sheet music app
iOS forScore, LLC

Tempo - Metronome app
iOS - Frozen Ape Pte, LTd.

GuitarToolkit - All-in-one guitar app
iOS - Agile Partners

DM1 - Drums app
iOS - Fingerlab Animoog

Synthesizer app
iOS  -Moog Music Inc.

Guitar Tuna - Guitar and bass tuner app with added extra features
iOS - Yousician Ltd

Capo Touch- App that helps one learn to play (along) existing songs by breaking them down
iOS - SuperMegaUltraGoovy, Inc.

PentaScore - App that listens to the instrument and transcribes the music directly into notes
Android Tuanis Apps

Guitar and Violin Tuner
Android A4tune LAbs

My Master 
www.mymaster.me

Naxos Little Mozart

Wolfgang -  English -  Dutch - German

Resource for complete piano care
http://www.total-piano-care.com/

Piano technician in Ottawa, Canada
https://www.jackkirschnerpianos.com/

Piano services Oxford, UK
http://www.knabepianos.com/

PNOmation, self-playing-piano services
http://www.qrsmusic.com/default.asp

Not the official brand site, but site on the history of the instrument and makers
http://schweighofer.tripod.com/index2.htm

Piano information & appraisal site
http://www.bluebookofpianos.com

Informational piano site, run by a Canadian piano technician
https://www.pianola.ca/

Piano rental, moving, tuning etc. shop in Chicago, USA
http://www.chicagopianorental.com/

Piano services in Whanganui, New Zeeland
http://www.piandreas.co.nz/

Piano services, Hawkesville, Canada (also able to move gun safes)
https://www.apollopiano.com/

Looking up information about your piano
https://onlinepianoatlas.com

Piano moving company, Nashua and Arlington, USA
https://www.mtauburnpianomovers.com/

PDF site with information about the Brinsmead piano made in London, UK.
http://www.brinsmead.net/brincatalog.pdf

Piano services, West Chester PA, USA
https://www.sweeneypiano.com/index.cfm

Piano services, San Diego CA, USA
http://delmarpiano.com/

Piano services shop (restoration, sales, accessories). Has also a piano virtual appraisal part, to check the worth and age of your piano.
http://www.esteypiano.com/

General music accessories store also sells instruments, globally
https://www.thomann.de/gb/index.html

General music accessoires store, also sells instruments, globally
https://www.gear4music.be/en/

amaha.com/en/products/musical_instruments/pianos/accessories/index.html
Mainly piano accessories, Clitheroe, UK
https://www.pianoaccessoryshop.co.uk/

Music accessories shop, globally
https://www.keymusic.com

Piano tools, parts, supplies, accessories / instructional videos on piano repairs, tuning, regulation etc., Hortonville WI, USA
https://www.howardpianoindustries.com/

Part of Roland site, accessories for piano
https://www.roland.com/uk/categories/pianos/accessories/?lang=en-GB

Online piano brand names library
http://www.concertpitchpiano.com/PianoBrandNames.html

Site for finding information about piano brands/Piano tuner, Maarssen, The Netherlands
https://www.jvanmedevoort.nl/

Piano Balleron, Piano services store, Paris, France. Contains also information about the piano and (historic) piano brands
http://www.pianos.fr/en/

Site about piano brands in The Netherlands
http://www.lieveverbeeck.eu/de_Nederlandse_piano.htm

Piano restoration services, include piano brands library, Pine Brook NJ, USA
https://www.lindebladpiano.com/

Allround-piano shop/home of the association of blind piano tuners, UK. A wealth of information on pianos, from finding shops to piano history to buying accessories online.
https://www.piano-tuners.org/

Piano related products
https://www.pianoaccents.net/

Intelligent controller that connects an 8-key input device to a full range of 88 keys of the acoustic piano
https://magenta.tensorflow.org/pianogenie

Piano tuner and technician in Jordan Station, Canada. The site has a handful of articles about certain (Canadian) piano brands.
http://www.pianotech.ca/index.htm

(Online) publisher of a guide to buying pianos, helping one make decisions concerning the purchase of a piano
https://www.pianobuyer.com/

Piano restoration services, sales as well, Reading, UK
https://www.harmonypianos.co.uk/

Piano restoration and other services, Trumansburg NY, USA. The site contains a massive bibliography on the history of piano building, with over 2700 entries
http://www.mozartpiano.com/en/

 

https://www.insure4music.co.uk/

http://www.allianzmusicalinsurance.co.uk/

https://www.eandl.co.uk/musical-equipment-insurance

https://www.endsleigh.co.uk/personal/home-insurance/musical-instrument-insurance/

https://www.anderson-group.com

https://musicins.com/

https://www.axa-art.com/uk/en/product/musical-instruments-policy

https://www.nationwide.com/musical-instrument-insurance.jsp

Musical America publishes every year a great overview of a big selection of worldwide music competitions.
COMPETITIONS_2019

Other competitions can be found on

http://www.bakitone.com/

https://www.musicalchairs.info/competitions

Musical America created a full PDF with summer camps and programs
CAMPS_2019

Masterclasses can be found on
https://www.musicalchairs.info/courses

http://www.chamberlainmusic-education.co.uk/

https://www.tts-international.com/primary/music-mes/books-teaching-resources

https://www.limelightmusicschool.com/book-supplies-instruments/

https://www.lmsmusicsupplies.co.uk/

 

ASTA - American String Teachers Association
https://www.astastrings.org/

AUSTA - Australian Strings Association
https://www.austa.asn.au/

CAREERS IN MUSIC
https://www.careersinmusic.com/

CLASSICAL:NEXT 
https://www.classicalnext.com/net/

Cyprus Centre for the Research and Study of Music
http://www.ccrsm.org.cy/

ECMTA - European Chamber Music Teachers' Association
https://www.ecmta.eu/

ELIA Art schools - European League of Institutes of the Arts
https://www.elia-artschools.org/

EMCY - the European Union of Music Competitions for Youth
https://emcy.org/

ENCATC is the European network on cultural management and policy.
https://www.encatc.org/

EPTA - European Piano Teachers Association
https://epta-europe.org/

European Music Council
https://www.emc-imc.org/

Festivalfinder
https://www.festivalfinder.eu/

Hello Stage
https://www.hellostage.com/

International Music Council
http://www.imc-cim.org/

MUSIC:ED - global music network
https://musiceducation.global/

Music Australia
https://musicaustralia.org.au/

MTNA - Music Teachers National Association US
https://www.mtna.org/

NEPTA - New England Piano Teachers' Association
http://www.nepta.info/

The Classical Network 
http://www.wwfm.org/#stream/0

WFIMC -  World Federation of International Music Competitions
https://wfimc-fmcim.org/

encatcSCHOLAR - on Cultural Heritage and Higher Education
http://blogs.encatc.org/encatcscholar/?cat=44

European Music Council Agenda - an ongoing dialogue between policymakers and music sector stakeholders.
European-Agenda-for-Music-2nd-edition