In 2005, Lopez began working on a new musical project with his musical partner Jeff Marx, and with Matt Stone and Trey Parker, the creators of "South Park", a series which, in 2003, Lopez had mentioned as a partial inspiration for "Avenue Q". "The Book of Mormon" premiered on Broadway at the Eugene O'Neill Theatre on March 24, 2011, following previews from February 24. The show received numerous theater awards, including the 2011 Tony for Best Musical, as well as two more Tony Awards for Lopez: Best Original Score and Best Book of a Musical. The production's original cast recording also earned Lopez the 2012 Grammy Award for Best Musical Theater Album.