After the hot mess that was the artpop release — an album campaign so deflated it can no longer be referred to in all caps — Lady Gaga fans need a palate cleanser. Understanding this as well as anybody is Lady Gaga herself, whose upcoming duets album with jazz legend Tony Bennett takes an unexpected approach to reminding fans why they’re drawn to her in the first place. Stripped down and no-frills in a way her solo material rarely is, Gaga’s new material would be more of a head-scratcher if her collaborator wasn’t so iconic (does anybody turn down Tony Bennett?) and if it wasn’t so well suited to her fondness for old-school showbiz.