Simply Piano - Fast and fun way to learn piano
Stave'n'Tabs - iOS and macOS notation and tablature editor with MIDI and MusicXML files support and chromatic...
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Chordsheet Maker - Create chord sheets or lead sheets quick and easily from your iPad. Add rhythms, endings, segno, codas and all what's necessary for your musicians to know what's your music about. Transcription made easy!
Yousician - Learn to play music at home, at your own pace
Tonelib JAM - Create, edit, print and listen to tablature and guitar sheet music