LIMITED SEATED SHOW WITHOUT RESERVED BOOTH EXPECT TO STAND. -- BOOTHS DO NOT INCLUDE ADMISSION.-- No one has to tell John Corbett that Hollywood stars moonlighting as musicians don’t always get taken seriously. He’s already faced crowds full of skeptics wearing expectant looks that silently challenge, “All right, actor boy, show us what you’ve got.” But Corbett’s never had a problem doing just that, onstage with his band or on radio airwaves. His self-titled debut album, released in 2006, climbed to No. 42 on Billboard’s Country Albums chart, surprising even the guy who rose to fame as Cicely, Alaska’s resident radio deejay on the “Northern Exposure” TV series (and made women swoon in “Sex and the City” and “My Big Fat Greek Wedding”). With his new album, Leaving Nothin’ Behind, on his own Funbone Records label, Corbett confirms what fans of John Corbett quickly recognized: He was never just moonlighting in the first place. Growing up in the shadow of Wheeling, W.Va.’s famed Capitol Music Hall, just a few miles from where Brad Paisley was raised, music was always Corbett’s first love. He’s been playing since he can remember.