Of the three late night talk show hosts, Jimmy Fallon is the only one with pretty serious musical ability. He puts it to work once again with his awesome house band The Roots, as they team up with the "Voice" coaches to do some fun acapella singing with a nod to "The Brady Bunch." This image from the video is quite fetching I think - particularly the look provided by Roots drummer and bandleader QuestLove (third from right, top row). Watch and enjoy.