Actors picking parts

A director is screen testing Sylvestor Stallone and Arnold Schwarzenegger for a new film about classic composers. Not having figured out who to give which part to, he asks Sly who he would like to be.

Stallone says "I like Mozart. I want to be Mozart"

So the Director says, "Very well, you can be Mozart" Then he turns to Arnie and says "Arnie, who would you like to play ?"

And Arnie says "Ah'll be Bach!"