(Recent pop, not popular as in, "Well Mozart and Verdi were very popular in their day, so that's pop music too you know..."

I thinking of the type of poplar music that's on the radio, 1930's or whenever to the present, not jazz, not classical, etc.)
Frank Zappa was mentioned in classes for pieces in different meters.
I'm thinking there's probably something with hip hop or rap, electronic music, and something with sampling maybe.
And then I still stand by the idea that technology will produce some other way of creating music. Autotune comes to mind.
Otherwise in terms of musicians.... Take Elvis, the Beatles, David Bowie, anyone else... Did they do anything that changes music/history beside just being popular and their own showmanship style (which isn't really music, is it?)?