Lynn's vocals feature on the following albums...

Anuna:

Invocation
Behind the Closed Eye
Winter Songs
Sensation
Illumination
The Best of Anuna
Revelation
Invocations of Ireland (DVD)

Riverdance:
Riverdance 10th Anniversary Edition
The Best of Riverdance DVD

Celtic Woman:
The Greatest Journey
Songs From the Heart CD / DVD
Lullaby
Solo

Colm Ó Foghlú:
Aifreann na nAingeal
Ceol ar Snámh ón Spéir Anuas
Eoghainín na nÉan / Íosagáin

Diablo 3:
Soundtrack

Solo Albums:
Take Me With You
Saturn Return