Which genre of music makes the most money?

Due to the difficulties of defining an artist today, the common ground would be rock. Whereas Linkin Park and Stone Sour are known to be NU-Metal, that is considered rock. Lady Gaga is weirdly also in this category. weird but true. Therefore due to the scale of who fits where, Rock is the top of the pile, followed by Rap/Hip-Hop, and R&B