William Beckett (singer) Guest appearances Guest appearances

| Year_ | Song | Work_done | Artists | Album |
|---|---|---|---|---|
| 2005 | Sophomore Slump or Comeback of the Year | Guest vocals | Fall Out Boy | From Under the Cork Tree |
| 2006 | 7 Weeks | Guest vocals | Gym Class Heroes | As Cruel as School Children |
| 2006 |  Bring It (Snakes on a Plane)  | Guest vocals | Cobra Starship | While the City Sleeps, We Rule the Streets |
| 2006 |  There`s a Class for This  | Guest vocals | Cute is What We Aim For | The Same Old Blood Rush with a New Touch |
| 2008 |  What a Catch, Donnie  | Guest vocals | Fall Out Boy | Folie à Deux |
| 2008 | Hold On (Remix) | Guest vocals and remixing | Good Charlotte | Greatest Remixes |
| 2011 | For the Love of a Daughter | Writing | Demi Lovato | Unbroken |