We had also a problem with our son when he was a baby to get him sleep. Mostly we were succesful when playing the CD Laurel and Hardy´s Music Box, Vol.2. However this did not always work...
We used this all the time on children and they were out before it ended! There was only a few times we had to start it over again. My sister-in-law asked for a copy after we got my nephew asleep on a visit.
Assuming it's a good idea to play music, I would make a mix CD of the most soothing cues from various scores.
A VIEW TO A KILL: Wine with Stacy SOMEWHERE IN TIME: Main Title SILENT RUNNING: Main Title, Tending to Huey TITANIC: Rose THE BEST YEARS OF OUR LIVES: Homer Goes Upstairs BATTLESTAR GALACTICA (1978): Cassiopeia and Starbuck BATTLESTAR GALACTICA (remake) Year 3: Admiral and Commander THE SPY WHO LOVED ME: Anya FOR YOUR EYES ONLY: Take Me Home ROCKY III: Mickey SUPERMAN THE MOVIE: Jonathan's Death THE BEST OF STAR TREK: Suite from the Inner Light
Vale Decem - Doctor Who Series 4: The Specials - Gold Blade Runner Blues - Blade Runner - Vangelis I Move On (Sintel's Song) - Sintel - Morgenstern Gayne Ballet - Khatchaturian Adagio for Strings - Barber Venus, Bringer of Peace - The Planets - Holst Fantasia on a Theme - Tallis Nocturne - Billy Joel Gabriel's Oboe - The Mission - Morricone The Cloud - Star Trek: The Motion Picture - Goldsmith Main Title - Aliens - Horner Wild Theme - Local Hero - Knopfler Boe - Doctor Who - Gold Phillippe Describes Isabeau - Ladyhawke - Andrew Powel Life and Death - Lost - Giacchino Spock - Star Trek: The Wrath of Khan - Horner Princess Leia's Theme - Star Wars - Williams
Worked fairly well.
My children have proven to me that even I can get sick of listening to Superman.