Mayer Hawthorne wears a lot of hats in the music business, including as a singer, songwriter,producer, arranger, audio engineer, DJ, rapper and multi-instrumentalist. When he’s on tour, though, he’s a soul and neo-soul singer with a strong liking for Sixties and Seventies-era R&B in the style of Holland-Dozier-Holland. Hawthorne has been on Conan and the Letterman show recently, as well as having a variety of guest spots on other TV shows, plus songs in various shows. He didn’t really set out to be an artist but was prevailed upon to try it out. Now he has four albums to his credit plus a long list of singles. His most recent, Where Does This Door Go, was released in July. He’ll appear at Headliners, along with Superhumanoids on September 19. Tickets are $18.