Heartwork is the quintessential Carcass album. You should be able to find that at any decent music store. Swan Song was OK, but Heartwork is amazing.
The "Black Star" CD was Jeff Walker (bass/vox) and some other guys. He was the only one from Carcass involved, I think. It was kind of meh.
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"If honesty is the best policy, then, by elimination, dishonesty is the second-best policy. Second is not all that bad."
-George Carlin