Any libraries for MPEG?

Are there any libraries for MPEG out there or in Visual Studio (I have .Net
2003, but willing to upgrade)? I want to be able to read, write, play and
generally do stuff with MPEG and MP3 files.

Any pointers appreciated.

TIA,
--
Anil Gupte
www.keeninc.net
www.icinema.com