This song came out (1971) in my Senior year in High School. If you include music by early versions of Chicago and Blood Sweat & Tears, it's probably as close as Rock N Roll came to fusing with Jazz and Big Band music. I guess you could call these guys one-hit wonders. But it sure was a great song.
BTW - this is NOT a cover band. It IS Lighthouse. Not bad for a bunch of guys in their late sixties and early seventies. The performance is from March, 2012 and they're still rocking.