PyMusic is a new kind of music player/organizer, based on a dynamic database management. You can create a new database (called library or lib) simply inserting a folder that contains music. You can reuse the database every time you want, or choose another folder and create a new database. Using a pre-existent database is fast and simple, but if you want you can use the databases as playlists and create a database for each folder.
PyMusic use gstreamer to play music and mutagen to read and modify tags.