[jharp146]

Some great music programs that I use all the time on my phone are MeTeOr, Z4Soft, Pocket Tune, etc. There are a lot out there. MeTeOr is an awesome multitrack digital recorder, which isn't close to what you can get on an actual computer since you can't have a real audio interface but is still neat. Also, you have to use a headphone and microphone, otherwise you'll get some serious bleedover through the built in mic and speaker, but it's still great for travelling and laying down ideas. Z4Soft is a great sequencer for drums, piano, etc., and is great to use in tandom with MeTeOr. Pocket Tune is a metronome/pitch machine. Great for just getting references for playing live. There are a lot more out there that I've seen, just haven't tried yet.