Walrus/Groon is a collaborative 12" EP between the Japanese experimental doom band Boris and Japanese noise musician Merzbow. It was first sold at the 2007 South by Southwest festival in Austin, Texas."Walrus" is a cover of "I Am the Walrus" by The Beatles, specifically the Spooky Tooth 1970 version. "Groon" shares its name with a King Crimson improvisational piece, but has no musical resemblance.