What's the difference "musically" between the two? I was reading this http://www.binkie.net/wrdisc/Mr. Gone.html when jaco said: ...because if there's a heavy feel, it's r&b, not rock. There's a difference between rhythm and blues and rock 'n' roll. I grew up playing nothing but colored music all my life and that's it. So far, I would say that for RnB, the chord changes are not as rapid as Rock and Roll.