Easy does it. Even during the late-night talk shows. Look no further than Wednesday’s musical lineup, which featured two acts with virtually nothing in common but their shared commitment to keeping things mellow. In this corner: T-shirted California rockers Incubus, resurrecting their 20-year-old hit Drive on The Late Show With Stephen Colbert to hype their upcoming anniversary tour. In that corner: Tuxedo-clad country-pop foursome Little Big Town, performing their new single The Daughters on The Tonight Show Starring Jimmy Fallon. The choice is easy. Unless you wanna rock. Then you’re kinda screwed. Sorry.