I’m not sure about the tiger, but Sean Lennon summoned some psychedelic ghosts during his exciting performance at the Great American Music Hall. As you might know, he's the 38-year-old son of John Lennon and Yoko Ono. Sean and his girlfriend Charlotte Kemp Muhl, a world-class model, have formed the indie psych-rock band called The Ghost Of A Saber Tooth Tiger, or GOASTT for short. The group has had various incarnations since 2008, and their second album, Midnight Sun (Chimera Music), is part of their ongoing journey.