Nothing like a blast from the past to fight the end-of-January doldrums. Created to celebrate the 50th anniversary of the Beatles’ Sgt. Pepper’s Lonely Hearts Club Band, Pepperland abounds with choreographer Mark Morris’ native wit and theatrical savvy. Dancers in dark glasses and vivid Carnaby Street colors echo psychedelic trips, riffs on Indian music, Asian spirituality, and all the pop-culture folderol of the Swinging Sixties. Morris’ movement borrows from modern and classical Indian dance, ballet, global, and folk dance forms. They make inspired pairings with the infinitely eclectic music of the Fab Four. Well, it’s not exactly their music, rather a reimagining of it by Ethan Iverson, whose bold new arrangements of selections from the album are performed live by a jazz ensemble of trombone, vocals, sax, percussion, and, yes, even a theremin. Expect both a deconstruction and a celebration of Beatlemania.