When it comes to iconic film franchises, Batman is unique in the sense that there's not really one musical theme that defines the character. Sure, there are plenty of cues that immediately conjure the caped crusader to mind, but from Neil Hefi's groovy TV theme to Danny Elfman, Hans Zimmer, and all the animated adventures in between, Batman's sound has evolved with each new incarnation. The next composer to take the mantle is Michael Giacchino, who's re-teaming with director Matt Reeves after their work on Let Me In and the last two Planet of the …