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6.01 - Zod
No music in this episode

6.02 - Sneeze
No music in this episode

6.03 - Wither

• It ends tonight by the All-American Rejects
  plays at Lex Luthor's costume party by special guests the All-American Rejects
  
• Ache by James Carrington
  plays throughout the fifth act of the show
  

6.04 - Arrow
No music in this episode

6.05 - Reunion

• Ease my pain (created for the show and not commercially available)
  plays when Oliver is practicing his archery and Clark confronts him
  

6.06 - Fallout

• Fresh azimiz by Bow Wow
  plays during the basketball game at the start of the episode
  

6.07 - Rage

• Cain and Able by Josh Kelley
  plays at the end of the episode
  

6.08 - Static
No music in this episode

6.09 - Subterranean

• Prelude 12/21 by A.F.I.
  plays when Lex goes to check on things back at 33.1 at the very end of the episode

6.10 - Hydro
No music in this episode

6.11 - Justice

• High and low by Greg Laswell
  plays during the very last scene between Lois and Ollie
  

6.12 - Labyrinth

• Yesterday by Hefshill
  plays at the end of the episode
  

6.13 - Crimson

• Our finest hour by Ginger
  

6.14 - Trespass

• Roadside by Rise Against
  plays at the end of the episode
  

6.15 - Freak

• Closer to you by Samantha Mollen
  

6.16 - Promise

• You could be happy by Snow Patrol
  plays at the very beginning of the episode
  
• Heavenly day by Patty Griffin
  plays at the end of the episode, when Lana and Lex are exiting the church and Clark is watching in the crowd
  

6.17 - Combat
No music in this episode

6.18 - Progeny

• Steppinby Telepictures
  
• As you get closer by Telepictures
  
• Scruggs by Telepictures
  
• Figured out love by Telepictures
  
• Overture: the flying Dutchman by Extreme
  

6.19 - Nemesis
TBA

6.20 - Noir
TBA

6.21 - Prototype
TBA

6.22 - Phantom
TBA