St. Vincent - aka- Annie Clark filled in for Jon Batiste along side The Late Show With Stephen Colbert house band Stay Human - and during a commericial break - they busted out an amazing funky / jazzy cover of  Fleetwood Mac’s “Dreams” 

Only the studio audience at the Ed Sullivan Theater that night was lucky enough to see the full performance - until now -  as the cover has been uploaded to the show's “The Late Show Commercial Breakdown” YouTube series.