For those who still have seasons 3 & 4 I have some music questions There's an instrumental that is played in the first episode of season 3 (revenge is best served cold) while Grissom and Warrick are walking to the crime scene (after the little chit-chat about the slot machines) It's also repeated in the 16th episode "precious metal" at the ending (after Greg's talk with Grissom) The other instrumental is a bit confusing, in the "XX" episode (#17) in season 4. After Catherine finishes off speaking to the suspect at the ending, there's a short instrumental that was used in a prior episode but I'm not sure when