With RetroPlayer you can listen to classic computer tunes from the 1980's & 1990's, including Commdore 64 music, Atari XL and Amiga & PC tracker modules. The first version is now available for download in BlackBerry World.
Also a quick bug fix release was just submitted for review. It fixes the missing next/prev functionality for Atari files and also enables all supported Atari music formats. Should be available soon I hope.