Biography
There are at least two artists with this name.
1. Swamp Rat is an original acoustic-folk rock band formed in 1974.
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2. Swamp Rat is an Experimental / Country / Rockabilly band comprising Dan Cohen (guitars), James Cook (bass), Derek Mixon (drums & percussion). Their self-titled debut album came out in 2008.
Biography text from Last.fm, available under CC BY-SA.