I think the same is going to happen for James, but with Katy Perry. He sings her song, Roar, constantly. Mainly the "ro-ar-ar-ar-ar" part. And it is not quiet. He sings it at his full volume. While it is a very empowering song, I would like him to start learning Dark Horse, just for some variety during our commute.
For reference, the words he is singing are:
...fighter, dancing through the fire
'cause I am a champion
and you're gonna hear me roar.
Just in case that is not crystal clear.