"This is gonna be a long night," Mayer Hawthorne said to the packed crowd at Webster Hall Thursday night after set-opener "Your Easy Lovin' Ain't Pleasin' Nothin'," a knee-shaking nod to the Temptations. Flashing a cheeky grin as light reflected off his thick-framed Buddy Holly spectacles, he then confessed, "I got goosebumps. I mean, c'mon, it's New York City." True. But any anxiety the 31-year-old Hawthorne (born Andrew Mayer Cohen) harbored on the opening date of his U.S. tour quickly dissipated into the curtain behind him and his four-piece band, the County. The singer, a leader in the recent White Soul Boy Invasion with his SPIN-approved debut album, A Strange Arrangement, strutted around center-stage with tambourine in-hand, wooing the audience with vintage Motown melodies delivered with confidence and silky-smooth style. He dressed the part, too.