Pragha is an open source and lightweight music manager software that aims to be fast, bloat-free, and light on memory consumption. It is written completely in GTK+ and C.
Here are some key features of "Pragha":
Library management using sqlite3
OSD support with Libnotify
mp3, ogg, flac, modplug, wav and Audio CD support
Playlist management (M3U Exporting)
DBUS management interface