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At the TCA (Television Critics Association) press tour today, Greg Berlanti revealed the villain for the upcoming Supergirl /The Flash musical crossover will be none other than The Music Meister.

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The Music Meister was created for the animated series Batman: The Brave and the Bold's own musical episode, where his powers caused the superheroes and villains he encountered to break into song. Since the musical Flash/Supergirl crossover was announced, fans have speculated a live-action version of the character would be a natural way to make the plotline work.Neil Patrick Harris voiced the Music Meister on Brave and the Bold. But could he play him on the show? Said Berlanti, about Harris' potential involvement, "We haven't gone about casting yet. It's the right question though!"We asked Harris about the possibility a few weeks back when we spoke to him in the video below.Supergirl and The Flash executive producer Andrew Kreisberg also spoke about the musical crossover at TCA later in the day, remarking, “Hearing Melissa [Benoist] and Grant [Gustin] sing. ... I hear Melissa sing all the time, so for you guys to hear that finally will be so great. As much as we hope these shows speak to people, whether socially or Alex's storyline and what it means to people, at the end of the day we're trying to entertain people. ... To be able to do a musical episode is so exciting to us. If anything, it's what I would always love about what Joss Whedon would do [on Buffy] with “Hush” or “The Body.” He'd have these very special episodes, but they were intrinsic to the ongoing storytelling that was going on.”As for The Flash/Supergirl crossover specifically, he explained, “When we get to the musical episode, both Barry and Kara will find themselves at pivotal crossroads on their respective series, and the experience of going through the musical will have a great impact on both series going forward.”Regarding the possibility of casting Neil Patrick Harris as the Music Meister, “We're certainly huge fans of him and as the casting process proceeds we'll see what happens.”As for what characters will be involved, Kreisberg would only say, “There's going to be people from both shows singing,” but did clarify this is a crossover that will involve both series, explaining, “It's going to start on Supergirl and it's going to be resolved on Flash.”Lastly, the question came up about whether the episode would feature covers or original songs. Said Kriesberg, “We're still writing the script and trying to figure out exactly what we're going to do.”

Additional reporting by Terri Schwartz.Eric Goldman is Executive Editor of IGN TV. You can follow him on Twitter at @TheEricGoldman , IGN at ericgoldman-ign and Facebook at Facebook.com/TheEricGoldman