Other than Darren Criss, who wrote the music and lyrics for the musical A Very Potter Musical?
A Very Potter Musical: A Very Potter Musical (originally titled Harry Potter: The Musical and often shortened to AVPM) is a musical with music and lyrics by Darren Criss and A. J. Holmes and a book by Matt Lang, Nick Lang and Brian Holden. Darren Criss:  The theater troupe made "Billboard" history when their original album, "Me and My Dick", became the first charting student-produced musical recording , debuting at number eleven on the Top Cast Albums chart in 2010.
A. J. Holmes