I don't know how to say it in French but this is what it means:
he uses a lot of soul music as his background. This guy performs with computerized background and does the effects/beatboxing- which sends saliva flying

I like it to be just me and my mic and the footwork. I use a good ol' Shure SM58 microphone - when you sling as much saliva as I do, you need a mic that can take punishment.

Kid B has shared the stage with James Brown, Ray Charles, LL Cool J, Spearhead, the Neville Brothers

godfather of soul = James Brown

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Note added at 6 hrs 59 mins (2005-08-31 17:30:22 GMT)
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to spit = To freestyle/rap. A slang used in the hood, or ghetto."Yo dawg, spit a rhyme for us"

http://www.urbandictionary.com/define.php?term=spit

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Note added at 7 hrs 0 min (2005-08-31 17:31:20 GMT)
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beatbox

To create musical beats with ones mouth and vocal chords. To immitate a drum with ones mouth. To immitate unusual noises within a beat.Selector got on the mic and busted a beatbox while Gofer busted some fat rhymes