Wow... you know I think I'd have to think on that one. I know for a long time my theme tune was Garbage's "Stupid Girl" but then I was 13 and naive and very stupid on more than several occasions! For many years I've loved Bryan Adams' songs... but in the end I tend to love certain snippets from music - certain sounds - I adore the intro to Guns 'n' Roses "Sweet child o' mine" but once he opens his mouth it goes way downhill
I love the track from Disney's Mulan when she steals her father's armour and cuts her hair, and for those of you who have seen Atlantis (also Disney) I love the track when Kida walks on the water..... I identify more with sounds and some of them evoke really powerful feelings, more than identifying with one particular piece of music. I guess that's a theme tune in itself. The fact that we have so many emotions that are always there, just to varying degrees, that can be called to the surface by music... it's an ever changing constant in our lives. I'm an ever changing constant to those who know me best. Ooo I hate it when I get all philosophical!