Banshee: Premium Music Management for GNOME
I am the creator and lead developer of Banshee, a music management and playback application for GNOME, developed on Mono and GNOME technologies. From the Banshee Wiki:
With Banshee you can easily import, manage, and play selections from your music collection.
Banshee allows you to import CDs, sync your music collection to an iPod, play music directly from an iPod, create playlists with songs from your library, and create audio and MP3 CDs from subsets of your library.
Through plugins, Banshee can be extended to support podcasting, Internet radio, and much more.