Jimmy Fallon and Adam Levine of Maroon 5, spar in a hilarious (and impressive!) with musical impressions of Frank Sinatra (Head, Shoulders, Knees, and Toes), Bob Dylan (Rude), Michael Jackson (Sesame Street Theme Song), Iggy Azalea (Old MacDonald Had a Farm), and Eddie Vedder (The Muffin Man). All serious musicians do it on the road to getting better. Find great tools to imitate below….