Naming convention for MP3's

What is the Blackberry naming convention MP3's?

-# of characters allowed?
-Special characters allowed?

Bump
Bumpy

I'd suggest avoiding special characters since not all systems can deal with them.

I've got some fairly long names for my classical mp3 files. I don't know if there is a real limit but I know that the software for my Kenwood car audio did choke on file names that were too long but I don't recall what that limit was.