The Claypool Lennon Delirium is an American psychedelic rock band, currently composed of bassist/vocalist Les Claypool (best known as the bandleader of Primus, and guitarist/vocalist Sean Lennon, son of Yoko Ono and the late Beatles member John Lennon . After touring with Lennon's band The Ghost of a Saber Tooth Tiger (as well as Dinosaur Jr.) in 2015, Claypool invited Lennon to his guesthouse to drink wine, run some ideas and play drums. They enthusiastically began work on an old-school, psychedelic and progressive rock record.