Battle music toggle? Options

[pudding]

Hi!
Before anyone says anything, yes I know you can change the battle music using an event but (and please correct me if I'm wrong and you can do this by eventing!) I was wondering if there was a script to do this. Basically, each time the actors go into battle, a theme from a pool of 5 will be chosen at random so if you get into a battle the music changes every time. I'm sure you can do this with eventing and I just can't figure it out, but either way (scripting or eventing) help would be MAJORLY appreciated. A game with a good example of this is Visions and Voices if anyone has played that. I can't figure out how they did it . Much appreciated!