Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
Keezy Drummer - Make a beat in seconds
AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹
Sampulator - Make (and record) beats on your keyboard
FL Studio Mobile - Create & save multi-track music projects on a smartphone
GarageBand - GarageBand is a fully equipped music creation studio for Mac