Once an R&B star makes pure R&B music and it starts to cross over on the Pop charts if gives them a chance to spread in there music instread making the same genre of music which i think is a good thing. Alicia Keys make R&B music yet it crosses over to the pop charts which made her make more songs like No One which has more pop sound to it...to me doesnt matter if somebody makes R&B or pop music if u cant perform the song live then its gonna suck any way....when it comes to live performanes AK (when her voice is not tired) and Beyonce are the only 2 people who can deliver live thats why i would i would consider AK the Queen of R&B/soul and Beyonce the Queen of Pop/R&B. AK makes R&B songs that crosses over to the Pop charts and no matter what Genre of music Beyonce is singing its going to chart high because she gives one hell of a performances dancing or just singing. Also, once you have more fans you just cant cater to one genre.