In many countries, rock and jazz are not what's mostly played on radio in many countries.
OK, you're right; I overstated the specifics there. I think on the main points that count, though, we're actually more in agreement than not.
Well, as to whether you wanted me to concentrate on the first sentence where you talk of American pop music "of any era", or the second one which talks about VH-1 - which is not about music, otherwise it would be called MH-1

- I got confused.
And yes, Mozart *was* pop music in his time.
Drew, yes, I agree that Louis Armstrong was pop in the 20s-30s, but - not to be picky - not because of "Wonderful World". That wasn't recorded until 1968

. Back in his "first" heyday before WWII, you only occasionally heard him sing, he was all over that horn most of the time. In his later years he kind of re-invented himself in the studio (and on TV) and moved more and more to vocals and less and less horn, mostly because after years of playing that thing so hard, he actually started having lip problems which gave him problems continuing playing his instrument.
But you do make an excellent point about the young age and immigrant heritage of the US of A and the whole melting pot thing; I have no doubt that it was that kind of culture that helped make this part of the world a fertile petri dish for musical incest and evolution.
And yeah, things can be traced back much before us in many ways; hell, take it all the way back to the early development of the Western music scale by the ancient Greeks if you want.
But it remains true that there is a definitive and noticeable punctuation break in music styles right around the turn of the last century with the advent of ragtime and folks like Scott Joplin, that coincided well with the birth of recoding technology.
And the genealogical progression from ragtime to metal and beyond has been is very well researched and documented buy thousands of scholars from may countries and ethnicities. Yes there are tons of incestuous musical relationships and cross-pollinations which make it a messy geneology on the specific by-song or by-artist level, but the general paths are well known.
As are influences from other countries (can any one say "Paul Simon" or "David Byrne"...just for some more recent examples, so that you don't think I'm wallowing in the Great Depression or something

). But those influences, whether from the immigrant's traditions early on or whether from simple experimentation and creativity later on, were still run through the filter of American music history and experience. Nobody would mistake "Me and Julio (Down By The School Yard)" as an actual Latin song, but rather as an American song with and American take on the Latin rhythms and music styles it explores, with American music structure still evident in it as well.
G.