If you were on Family Feud and the question was "Name a music band from Ireland" with the top 5 answers on the board, would you play or pass? Let's see.... U2....and.... I'll pass.
Allow me to introduce another.
The only song on the Once soundtrack not performed by it's stars Glen Hansard and/or Markéta Irglová is this little ditty by the hard-to-pigeonhole band Interference. After sampling the eclectic mix on their website you may or may not become a fan, but when the other family can't come up with more than U2, at least you'll have a chance to steal.