One of the musicians who released the Grammy-nominated "Fallling Slowly"  is also a guitarist for what Irish group?
The Swell Season (album):  "Falling Slowly" went on to be nominated for a Grammy and win the Academy Award for Best Original Song in 2008. Glen Hansard: Glen Hansard (born 21 April 1970) is an Irish songwriter, actor, vocalist and guitarist for Irish group The Frames, and one half of folk rock duo The Swell Season.
The Frames