JAMS can mean two separate artists.

1. The KLF (also known as The Justified Ancients of Mu Mu (The JAMs), The Timelords and other names) were one of the seminal bands of the British acid house movement during the late 1980s and early 1990s.

http://en.wikipedia.org/wiki/The_KLF


2. JAMS is also a collaboration between South Florida DJs Esoteric and Dasmask.

http://www.facebook.com/JAMStheParty