I only have one reason why I believe Hiphop is the greatest genre of music.
To my knowledge Hiphop is the only genre of music that consistently introduces its listeners to other genres of music and artist.
I'm a DJ so trust me I can post examples for days but I don't really feel like doing that lol. Instead I encourage you to take a look a your favorite songs new or old and see what they sampled via http://www.whosampled.com
As a matter of fact I will drop one gem on y'all from that new Jay Z Album 4:44