Here's a list of all the songs that we've heard on Buffy.
"Buffy's Theme" by Nerf Herder
SEASON ONE
"Welcome to the Hellmouth"
"Saturated" by Sprung Monkey
"Believe" by Sprung Monkey
"Swirl" by Sprung Monkey
"Things Are Changing" by Sprung Monkey"The Harvest"
"Right My Wrong" by Sprung Monkey
"Wearing Me Down" by Dashboard Prophets
"Ballad for Dead Friends" by Dashboard Prophets"The Witch"
"Twilight Zone" by 2 Unlimited"Teacher's Pet"
"Already Met You" by Superfine
"Stoner Love" by Superfine"Never Kill a Boy on the First Date"
"Strong" by Velvet Chain
"Treason" by Velvet Chain
"Rotten Apple" by Three Day Wheely
"Junky Girl" by Rubber
"Let the Sun Fall Down" by Kim Richey"The Pack"
"All You Want" by Dashboard Prophets
"Reluctant Man" by Sprung Monkey
"Job's Eyes" by Far"Angel"
"I'll Remember You" by Sophie Zelmani"Prophecy Girl"
"I Fall to Pieces" by Patsy Cline
"Inconsolable" by Jonatha Brooke
SEASON TWO
"When She Was Bad"
"It Doesn't Matter" by Alison Krauss & Union Station
"Spoon" by Cibo Matto
"Sugar Water" by Cibo Matto"School Hard"
"1000 Nights" by Nickel
"Stupid Thing" by Nickel"Inca Mummy Girl"
"Shadows" by Four Star Mary
"Fate" by Four Star Mary"Reptile Boy"
"Wolves" by Shawn K. Clement & Sean W. Murray
"Bring Me On" by Act of Faith
"She" by Louie Says"Halloween"
"Shy" by Epperley
"How She Died" by Treble Charger"Lie to Me"
"Lois, On the Brink" by Willoughby
"Never Land (a fragment)" by The Sisters of Mercy
"Reptile" by Creaming Jesus"Surprise"
"Anything" by Cari Howe
"Transylvanian Concubine" by Rasputina"Phases"
"Blind For Now" by Lotion"Bewitched, Bothered and Bewildered"
"Pain" by Four Star Mary
"Drift Away" by Naked
"Got the Love" by The Average White Band"Passion"
"Never an Easy Way" by Morcheeba"I Only Have Eyes For You"
"Charge" by Splendid (personal favorite)
"I Only Have Eyes For You" by The Flamingos"Go Fish"
"Mann's Chinese" by Naked
"If You'd Listen" by Nero's Rome"Becoming (Part 2)"
"Full of Grace" by Sarah McLachlan"Anne"
"Back to Freedom" by Bellylove
"Dead Man's Party"
"Never Mind" by Four Star Mary
"Sway" by Four Star Mary
"Faith, Hope & Trick"
"Going to Hell" by The Brian Jonestone Massacre
"The Background" by Third Eye Blind
"Cure" by Darling Violetta
"Blue Sun" by Darling Violetta