candidate: Alongside synthpop duo , Owl City , the Canadian chanteuse sang their collaborative single , " Good Time " , at " America 's Got Talent " on August 22 , 2012 , " Today " on August 23 , 2012 , U.S. Open 's " Arthur Ashe Kids ' Day " on August 25 , 2012 , " The Tonight Show with Jay Leno " on August 28 , 2012 , and " Conan " on August 29 , 2012 .