Double check my research:

Artist: OAR (Of A Revolution)
Title: Love and Memories
Album: Stories of a Stranger (2005)

Somewhere along the way, they received an edited theme song:
Title: It's Unbelievable (the title was equally unbelievably hard to
locate)
Artist: Groove Addicts
Composer: Dain Blair, Tony Phillips, Brad Chiet
URL: http://www.grooveaddicts.com/tvshows/assets/media/EHM_open_edit.mov

OAR performed it live on Season 3's 12/11/2005 "Holiday Wishes" "pay
it forward"-themed episode at the L.A. Free Clinic.