Celtic Thunder: Ivan Gilliland (guitar, mandolin); Brendan Monaghan (whistle, pipe, bodhran); Dave Cooke (keyboard); Nicky Scott (double bass, bass guitar); Liam Bradley (drums); Andrew Lavery (percussion).

Personnel: Alan Barr, Andrew Carlisle, Philip Bell, Gavin Noade, Glenn Cupples, Charles Noin (pipes, drums); Neil Byrne, Nigel Wheatley (background vocals); Dave Gold, Michael Keeney, Phil Coulter.

Recording information: Amberville Studios; County Antrim; Windmill Lane Studios, Dublin, Ireland.

Arrangers: Dave Gold; Michael Keeney; Phil Coulter.

Ireland's pop-vocal quintet Celtic Thunder became a sensation in the U.S. through a much-viewed PBS concert special. Their second album, ACT TWO, broadens their appeal even further. Singing in various combinations of solos and ensembles, the five vocalists tackle both Celtic ("Raggle Taggle Gypsy," "Danny Boy") and non-Celtic ("Knights in White Satin," "I Wanna Know What Love Is") material in an impassioned style that melds their Irish roots with eclectic pop sensibilities, positioning them as something like the Emerald Isle's answer to the Three Tenors.