Audacious (media player) works in 5.x, at least for MP3.
Besides audacious.tcz, had to download audacious-plugins.tcz, libmcs.tcz, vorbis-tools.tcz, libmowgli.tcz, libssl-0.9.8.tcz (and associated dep/md5 files) from 4.x repo. Other dependencies are available in 5.x.