I don't know if this helps, but if you go to abc.com you can get all the music for all of the episodes. The songs that it could have been could be:
Artist: Luce
Song: "Good Day"
Label: Nettwerk records
Artist: Turin Brakes
Song: "Rain City"
Label: Astralwerks Records
Artist: The Breeders
Song: "Cannonball"
Label: 4AD/Elektra
Artist: Bering Strait
Song: "Porushka-Paranya"
Label: Universal-South Records
Hope it helps!