tonestro - Practice & improve on your wind instrument while having fun
Metronaut - An app to help you play classical music
Violin by Trala - Violin by Trala is a music learning app that is designed specifically for Violin users.
Flat for Education - The music education platform your students will love
Yousician - Learn to play music at home, at your own pace
Scribd Sheet Music - All the sheet music, books and comics you want for $9/month