Spinning Paul Simon’s new album, So Beautiful or So What, you’re quickly reminded: Wait a minute—this guy is a pop star. That is to say, not just a prescient urban-folk bard and boomer hero but an actual hit maker. So Beautiful’s songs are often wildly infectious, effortless-seeming reprisals of Graceland’s brain-teasing, booty-moving mastery. After playing the Beacon Theatre, the songwriter returns for a rare club show.