Opening with a perfectly replicated doo-wop vocal stack, Umphrey’s McGee’s latest release, a ripping cover of David Bowie’s “Let’s Dance,” finds the Chicago-based veterans of the improv-rock scene sticking closely to the original wax from Bowie’s 1983 album of the same name. But this new version has a ringer that could’ve never been dreamed up those 41 years ago: the incomparable Huey Lewis on lead vocals.