Wow! Lots of intelligent, thoughtful responses - mostly - thanks! I appreciate it! While there are a lot of good points made, Ed's resonated with me the most. I agree that a great musical piece doesn't have to be complicated to be sophisticated. And it seems to me that great musicians in any style can make compelling music. Ed's example of Chet Atkins, for instance. But then, maybe great musicians can make great music regardless of the vehicle? At the end of the day, I think I agree with what I think is the consensus, that great music is independent of its musical style. I'll take the point that classical and jazz can offer good musical training. Not to say a musician can't master their instrument and develop musical sophistication by only studying and playing rock and roll, but the path to excellence might be less obvious? I'm not sure about this last part - I'll have to give it more thought.