Orfeus is plugin for Eclipse IDE which can play songs. It is very simple but works. I created it in one evening.
Orfeus support mp3, ogg vorbis and some other formats. This player is based on jlGui player.
It does not support: streaming, playlist (m3u), loop play and random playing. I have it in roadmap…
Player is reasonably fast, but for serious playing use xmms or winamp.