S.O.B. first took shape in 1983, and were known for being one of the premiere bands for bringing the speed of thrash to hardcore. They gained extra notoriety in 1990 when they did a split 7" with Napalm Death. The influence that the two bands had on one another can be easily heard on both band's albums during the early 90s.
A while back, I bought a bunch of tapes from a friend, and in that lot was this S.O.B. - Studio Session '92 tape. I've been unable to find any information about it on the internet, except for a couple of listings that claim in should have been from 1990, but those don't even have a picture of the cover. My friend got his copy off of Ryuji from BattleOfDisarm in the early 90s, and the insert lists a recording date of July 14th, 1992 at Studio 246, so I'm leaning towards it being an authentic original, but one can still never know for sure.
That being said, here's the S.O.B. studio session from 1992.
S.O.B. - Studio Session '92