| Year | Title | Notes |
|---|
| 2001 | "What a Curious Notion" | Backing vocals on this track from Mic Christopher's Skylarkin' album.
This album was finished by Christopher's friends after his death in 2001.[1] |
| "Get the Party Started" | A cover of Pink's single that featured as a duet with Damien Rice on Even Better Than the Real Thing Vol.
1, a charity compilation CD released in Ireland in 2003. |
| 2003 | "Then Go" | Hannigan sings this track, written by Damien Rice, on the Live from the Union Chapel live album. |
"Once I Loved", "Desafinado",
"Waters of March" | With Damien Rice, on the Goldfish Memory soundtrack.[1] |
| 2004 | "Sideways Down" | Backing vocals on this track from The Frames album Burn the Maps, released in 2004.[1] |
| 2005 | "Take a While" | Backing vocals on the album Pieced from Faded Memory by Galway-based band Lucas.
|
| "Coming Down" | Backing vocals on the album Pieced From Faded Memory b
|