NCAA March Madness is the branding used for coverage of the NCAA Division I men's basketball tournament that is jointly produced by CBS Sports, the sports division of the CBS television network, and Warner Bros. Discovery Sports, the national sports division of Warner Bros. Discovery (WBD) in the United States. Through the agreement between CBS and WBD, which began with the 2011 tournament, games are televised on CBS, TNT, TBS and truTV. CBS Sports Network has re-aired games from all networks. Initially, CBS continued to provide coverage during most rounds, with the three WarnerMedia channels covering much of the early rounds up to the Sweet Sixteen. Starting in 2016, the regional finals, Final Four and national championship game began to alternate between CBS and TBS. TBS holds the rights to the final two rounds in even numbered years, with CBS getting the games in odd numbered years. This joint tournament coverage should be distinguished from CBS's regular-season coverage, which it produces independently through its sports division. , none of WBD's outlets cover regular-season college basketball games. Games broadcast on all four networks use a variation of the longtime CBS College Basketball theme (which has been used since 1993) music composed by Bob Christianson. Background and coverage breakdown On April 22, 2010, the National Collegiate Athletic Association (NCAA) reached a 14-year agreement, worth US$10.8 billion, with CBS and the Turner Broadcasting System to receive joint broadcast rights to the Division I men's college basketball tournament. This came after speculation that ESPN would try to obtain the rights to future tournament games. The NCAA took advantage of an opt-out clause in its 1999 deal with CBS (which ran through 2013, even though the NCAA had the option of ending the agreement after the 2010 championship) to announce its intention to sign a new contract with CBS and Turner Sports, a division of WarnerMedia (which later was absorbed into Warner Bros. Discovery who, incidentally, jointly owned The CW with the CBS television network's corporate parent Paramount Global). The new contract came amid serious consideration by the NCAA of expanding the tournament to 68 teams. The agreement, which runs through 2032 (extended from 2024 in 2016), stipulates that all games are available nationally. All First Four games air on truTV. During the first and second rounds, a featured game in each time "window" is broadcast terrestrially on CBS (15 games), while all other games