Hey guys - I've been working with Appcelerator's Titanium for sometime now, but encountered a particular project for music. Corona can satisfy the performance requirements, but this app also needs access the the iPod library.
Putting in a request for the exposed playlist support. Cheers! :-)
This is being tracked as case #446
http://developer.anscamobile.com/forum/2010/07/25/access-music-library
-Tom