"Demondo (meaning "of the world") has been working with top reggae/roots/dub masters since the late seventies backing artists from Jamaica and the UK as a session bass player and later in the years to play various other instruments for Greensleeves / UK-Bubblers / Ariwa / and many others..." reggae news
If you are into dub, then you sould check this guy out. You can download his whole album, The Universe Shall Sound, for free here. The mp3's below are from this record.
(mp3) Black Hole dub
(mp3) Nebula dub
For some reason I'm in the reggae mood so here is Blaze Dem, a dub artist who is based in the UK Dub tradition. It's upbeat and loaded with samples.
(mp3) Martial World