4x01 Deep Down
| Burl Ives | Hush Little Baby |
4x02 Ground State
4x03 The House Always Wins
| Andy Hallett | It's Not Easy Being Green |
| Andy Hallett | Lady Marmalade |
| The Archies | Sugar Sugar |
4x04 Slouching Toward Bethlehem
4x05 Supersymmetry
4x06 Spin the Bottle
4x07 Apocalypse, Nowish
| Robert J. Kral | Start The Apocalypse (score) |
| Robert J. Kral | The End Of The World (score) |
4x08 Habeas Corpses
| Douglas Romayne Stevens | Another Way Out (score) |
4x09 Long Day's Journey
4x10 Awakening
4x11 Soulless
| Bad Manners | Teddy Bears Picnic |
4x12 Calvary
| B.J. Thomas | Raindrops Keep Falling On My Head |
| Douglas Romayne Stevens | Chasing Lilah (score) |
4x13 Salvage
| Robert J. Kral | Cordy/Connor theme (score) |
4x14 Release
| VAST | Here |
4x15 Orpheus
| Donna Summer | Macarthur Park |
| Richard Harris | MacArthur Park |
4x16 Players
| Douglas Romayne Stevens | Letting Off Steam (score) |
4x17 Inside Out
| Douglas Romayne Stevens | Cordy's Journey (score) |
4x18 Shiny Happy People
4x19 Magic Bullet
| Barry Manilow | Mandy |
| Curtis Mayfield | Freddie's dead |
| The Beach Boys | Wouldn't It Be Nice |
4x20 Sacrifice
| Douglas Romayne Stevens | Tunnel Battle (score) |
4x21 Peace Out
4x22 Home
| Robert J. Kral | Home (score) |
| West Side Story | Something's Coming |