Flowkey - The easiest way to learn piano with your iPhone or iPad
Backtrack - Record audio from the past
Yousician - Learn to play music at home, at your own pace
Penman - A voice-driven note taking app 🗣️📝
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Audio Recorder - ‘Audio Recorder’ is a small utility for recording audio.