I love theme songs or intro songs, whatever you like to call them. Hearing the song fills me with anticipation for the show I am about to view. Some of my favorites that have made it to my iPod are:
Theme from Psych - I know, You know by the Friendly Indians
Theme from Saving Grace by Everlast
Theme from True Blood - Bad Things by that country singer fella
The list goes on and on. Most of the time I can't even remember the title of the songs, but upon hearing them I know what show they go with.
Now apply this to writing. A few different authors have posted on their websites a list of songs that inspired them or ones that set the mood for their novel.
Then there is me. I do not like to listen to music while I write. None. In fact, if I had to pick a song to represent any of my writing, I just couldn't do it.
I have no theme song. Do you?