Vocal background music.

Originally Posted by Celvantis

vocal music would be great and all, but vocal music during dialogue scenes would be confusing its like counting when someones shouting random numbers at you.

You're probably right. The only way that it would work is if it were faint enough. Actually it might work. There are some episodes of Code Geass where they play a song during dialogue scenes. The music doesn't take away focus at all.