this is the complete song list from that episode i hope it helps
The Birthday Massacre "Happy Birthday"
Pete Yorn "Thinking Of You"
Tiesto feat. Tegan & Sara "Feel It In My Bones
Telekinesis "Tokyo"
Mike Sheridan and Mads Langer "Too Close"
Fauxliage "All The World"
The Black Box Revelation "Love In Your Head"
Switchfoot "Yet
Enablers - Captured Blues
The episode is called Prom Wrecker (second season). The song is at the very end of the episode.
The name of the song at the end of Season 8's Episode 20 which was titled "Beast" is "What You Feel" by Chris Levy.
it's "Sense of Touch" by Mark Isham :)
work - 123
Get the Wheel by Greg Dulli
Brenda Lee "I Wonder"
Lullaby by Sia
Keep yourself warm by Frightened Rabbit
Enablers - Captured Blues
It's Hide and Seek by imogen heap
Rocco DeLuca and The Burden-Swing Low
Bonobo - If You Stayed Over
Valerie June - Working Woman Blues
Valerie June - Working Woman Blues
Isobel Campbell & Mark Lanegan - Come On Over (Turn Me On)
"Last Call" by S.O.L.O. It's an unreleased track.