For their 2009 Disney Channel Original Movie, Hatching Pete, Musso teamed up with co-star Tiffany Thornton, from Sonny with a Chance, to record a song called "Let It Go" that was used in the film.
The two also worked on a music video for the song which was released to Disney Channel.
On June 2, 2008, Musso was a surprise guest at the Spotlight Awards at the North Shore Music Theatre in Beverly, Massachusetts.He presented awards to the Best Actor and Best Actress of the 2007–2008 theatrical year.And sang "Live like Kings" on Disney XD's Pair of Kings on Disney Channel.Also in 2009, Musso collaborated on the School House Rock song "The 3 R's"; an educational song about recycling.as Richie and The Keyman as a Cub Scout, both in 2002.
Musso also starred in three episodes of King of the Hill as the voice of Bobby Hill's friend Curt in the episodes "The Powder Puff Boys" and "Bobby Rae" as well as the surfer kid in "Four Wave Intersection" in 2007.The series began production in March 2010, following the production of the final season of Hannah Montana in which Musso will only be a guest. It was announced that Musso would be the host of Disney Channel's latest hidden camera reality series, Prank Stars, which premiered on July 15, 2011.On December 12, 2011, Disney XD renewed the series Pair of Kings for a third season.Musso also recorded a song called "The Girl Can't Help It" for another Disney Channel Original Movie, Princess Protection Program."Let it Go" and "The Girl Can't Help It" was featured on the Disney compilation album, Disney Channel Playlist, which was released on June 23, 2008.In July and August 2009, Musso opened for Metro Station.