VIDEO : Neil Patrick Harris Is Wonderful In 'Mayhem Of The Music Meister'

Neil Patrick Harris performed in the episode ?Mayhem of the Music Meister? in Batman: The Brave and the Bold, and fans loved it. His performance was fantastic not only because of his singing, but his voice truly embodied the villainess Music Meister. Now fans are wonderful if Harris will participate in the musical crossover of ?The Flash? and ?Supergirl.? He would e a great addition, so fans have their fingers crossed.