I tried SongPlayer after all the recommendations, but however I configured it, the sound was not as good as Mpega.
Seriously, use Mpega and see my previous post on how to configure it.
I have tried every way of playing MP3s I could find, and nothing beats this. I have it going 8 hours a day in my shop on my Amiga.
BMG might be ugly, but it is nice and clear and simple and functional with its own prefs gui.