FL Studio Mobile - Create & save multi-track music projects on a smartphone
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.
Audulus - A universe of sound at your fingertips - Audulus is a modular music processing app
Ableton - Music production software and hardware.
G-Stomper Studio - G-Stomper Studio is a feature-packed, mobile music production tool.
Keezy Drummer - Make a beat in seconds