Theatre 

Jagger has been doing theatre since he was 10. The very first play he did was Peter Pan. Before that all he had done was dance in front of crowds. Theatre had opened up an entire new world to him. It made him realize he was more than just a dancer. Theatre helped him realize that he could be a proper singer and helped him learn how to actually sing, instead of just winging it. He doesn't know every musical in the world, and doesn't know all the lyrics to Hamilton, but he loves and respects the world of theatre, and takes it very seriously. So seriously, that his senior year he was nominated for Best Actor, for his portrayal of Riff in West Side Story, and won best student choreographer at the Utah High School Musical Theatre Awards. He might not be the best thespian, but he has taken and applied everything that theatre has taught him.