For today only (4-16-12) you can download NodeBeat App on your Android enabled device for free.
App Description: NodeBeat is an experimental node-based audio sequencer and generative music application. By combining music and playful exploration, NodeBeat allows anyone to create an exciting variety of rhythmic sequences and ambient melodies in a fun and intuitive fashion. Enjoy easy navigation, including drag-and-drop to add or remove nodes, double-tap to start or stop octave generators, and a quick shake to clear the screen.
Install Android App Store - (It’s free and necessary for this download)s in a fun and intuitive fashion.