Vaughn Robert Squire, aka Sixtoo (formerly CL S.C.A.R.R.) is a hip-hop artist originally from Halifax, Canada who now lives in Montreal, Canada. He grew in fame on the anticon label, and is currently signed to British label Ninja Tune.

As a major player in the North American underground movement of the 1990s, Sixtoo is best known for his production skills, though he is additionally an accomplished rapper, turntablist, and graffiti artist. He is also known to collaborate with similar artists such as DJ Moves, Buck 65 (with whom he formed The Sebutones), DJ Signify, Simahlak, Sage Francis, Matth, the 1200 Hobos (of which he is a part) and stigg of the dump.
Sixtoo also work at Bully Records, he masters the recording at his studio.