-The original 25th anniversary theme song from DL, "DL is your Land", later became "Disney World is your World" for WDW's 10th anniversary, and was the re-used once again as "Dl is your Land" (with some minor lyrics changes to reference TDL) for TDL's opening day castle show, and was used for several years after that.
-TDR music catalogue is so vast that is has been passed on to all of the other Disney parks on Earth after originally being premiered at TDL... Examples:
TDL's Moving On, Cinderellabration and others have been used at the MK. Fantillusion music has gone to DLP. "All Aboard" from TDL's party Express has been used at HKDL and DLP. This past summer's DL fireworks show in CA used the "It's Magical" song which is originally TDL's 10th anniversary theme song... and so on..