Is there any music/midi programs for Handheld PC's out there on the market?

I'm a proud owner of a newly purchased pocket pc. It's great for my writing, drawing inspirations, but I'd love to be able to create/modify midi.

I'm not looking for anything elaborate. A simple function of creating track, recording a few notes in real time,.. Play it back, while recording on another track…

I've seen a few programs… but they're quite useless in functionality.

Any ideas?