Keith Urban, Sugarland and Def Leppard will perform at the 2009 CMT Music Awards , which will be held in Nashville on June 16 — one day earlier than previously scheduled. Tickets go on sale Saturday (May 2). Previously-announced performers include Toby Keith, Brad Paisley, Rascal Flatts and Taylor Swift. CMT will announce the four finalists in each of the categories, except video of the year, on May 19. Fans can then vote at CMT.com through June 15 to determine the winners. The final nominees for video of the year will be announced at the beginning of the live show. Fans can vote at CMT.com throughout the broadcast (ET/CT only) to determine the winner.