Chris Willman Senior Music Writer and Chief Music Critic Christmas has come early for Beatles fans… who fortunately have been granted a week between gifts, so they don’t have to choose which to unwrap first. There was Thursday’s release, of course, of the newsmaking “Now and Then” single, a track that features the late John Lennon and George Harrison that was recently completed by Paul McCartney and Ringo Starr, with Martin on board as McCartney’s co-producer.