Yellow Matter Custard was a Beatles tribute supergroup consisting of Mike Portnoy, Neal Morse, Paul Gilbert and Matt Bissonette.
Kasim Sulton played bass with the band in 2011, replacing Bissonette.
They take their name from a line in "I Am the Walrus", by the Beatles: "Yellow matter custard, dripping from a dead dog's eye".
[1] Conceived as more of a project than a band, they have only performed a total of five times: twice in 2003 (May 17 at Upper Montclair, New Jersey and May 18 at B.B.
Due to scheduling conflicts, Matt Bissonette was unable to play with the band in 2011, and thus was replaced by Kasim Sulton.