Rap music is all about attitude and nothing else, Kanye’s lyrics are mostly idiotic, but when he yells ‘heeuuuuuh’ it’s hard not to get into it.
I would extend this to all types of music but rap more than any other. I think this is why rappers can make great actors, they’ve already honed an attitude and a character. Another question would be why is it easier for musicians to become actors but not the other way around.
See Scarlett Johansson, and Keanu Reeves. Exceptions to this rule Drake and Childish Gambino. Maybe rapping and acting is interchangeable, but not rock and acting.
Maybe Jeremy Renner will dismantle this theory.