Switch Accessible iPod
I'm definitely an iPod fan. I'm trying to be more inclusive in my language by using mp3 player as a generic term but I find it hard to do all of the time. Check out this switch accessible device that allows the iPod (and probably other mp3 players) to be operated by individuals with physical limitations.
http://www.tecsol.com.au/pdfs/switchPod%20Instructions2.pdf
I've also seen an Intellikeys overlay that allows the user to play music that has been stored in the iTunes folder on your computer. Search the activity exchange portion of the Intellitools website for this adaptation.