Mujik [App Store] is a free (for now) app that allows you to create musical sounds by opening books on a shelf and chasing dust mites across the page.
It's a charming app, with interesting graphics, and I was able to create a passable tune. If your taste runs to Mike Oldfield or Brian Eno (who has his own app for creating music on the iPhone) you know the kinds of sounds I am talking about.
You do have some control over the instruments, the pitch, and you can balance the ensemble, if that is the word, by turning off any of the 3 channels.
The lads who made this app are from an Edinburgh, Scotland software company called Lucky Frame, and are obviously pretty creative in their offbeat way. The founder of the company says he wanted to create software that is "not intimidating and easy to use".
This app isn't to be confused with a composition tool, or a sequencer where you get a lot of control. It's something to play with and enjoy.
It would be nice if you could save your tunes, but instead they become fleeting memories. A 'save mode' is promised by the developers. Mujik runs on the iPhone and the iPod touch.
Thanks to Donnacha for the tip.
Here are some screenshots but they are just likely to confuse rather than illuminate. You just have to try it.