Tony Bennett

Frank Sinatra once called Tony Bennett ”simply the best singer in the business.” Best known for his hit “I Left My Heart in San Francisco,” Bennett continues to challenge himself. He recently went into the studio with Lady Gaga to record Cheek to Cheek, an album of jazz standards that includes their take on songs by the likes of George Gershwin, Cole Porter, Jerome Kern and Irving Berlin. It's a strange pairing but their voices ultimately mesh well on the album. Bennett played some dates with Gaga but for tonight's show, it'll be just him so expect to hear standards such as "Fly Me to the Moon" and "I Got Rhythm." (Niesel)