Just Press Record - A simple, professional audio recorder
Flowkey - The easiest way to learn piano with your iPhone or iPad
Cezan - Add audio recordings to your resume
Yousician - Learn to play music at home, at your own pace
SwiftScales Vocal Trainer - Train your voice with your own virtual vocal coach
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.