Champion soundtracks

So, would it be a bad idea if the theme music from the login to champions played sometimes instead of the summoners rift music?

I think it would be awesome for example if when I'm playing Nami sometimes Nami's theme would come on during the game.

Would also be a cool way to up the "cool" level of a pentakill by giving it a special sound byte that only plays when you get one.

All the login themes can be heard on the league of legends soundcloud.

Edit: How about also the Nashor's Tune theme when fighting baron nashor? There are so many more ways sound can be used to increase the level of experience on the rift.