One of the musicians who released the Grammy-nominated "Fallling Slowly"  is also a guitarist for what Irish group?
The Swell Season (album) The Swell Season is the self-titled and first album by the duo The Swell Season, (Glen Hansard and Markéta Irglová), released in 2006. "Falling Slowly" went on to be nominated for a Grammy and win the Academy Award for Best Original Song in 2008.
Geasa (band) Geasa is a Celtic metal band originating from Dublin, Ireland. Formed by Fergal Purcell and John Kavanagh in 1993 the band combines traditional Celtic music with black metal to form Celtic black metal. They have released one demo album, one EP, and three full-length albums.