The genre of music that you listen to depends on who you are and maybe even where you came from. Different people prefer to listen to different things that might even express themselves. Country singers never seem to rap, and you never hear a banjo in hip-hop. Why? Because that isn't where those singers came from, and that's not what kind of music that they would personally like to listen to.
There has been some debate on which genre is the most popular. Is it pop? Maybe its hip-hop? Actually, based on the recent music bought, and the charts of what people have been listening to, the most popular types of music are country and rock. Is this what you would consider the most popular?