Theme music for each party member?

[DrGustav]

Is there a way to write script triggers so when a party member is selected, the background music will change? I think it would be kind of neat for each of the characters to have their own leitmotif playing while you use them. Probably would have to either score some new stuff or borrow it from somewhere. Toss in some more works from John Williams, if you want to keep it consistent, but you could go nuts with it.