I've looked over and listened to the top us sales hits since the 50s. In the late 50s us rock really picked up steam until 59 when Booper, Valens and Holly died. I really understand what the mclean lyric 'day the music died' means now. Until 64 Music really reverted back to the light weight pop tunes popular in the early 50s. Then throughout the 60s the british really dominated the top charts. America had a lot of really good rock bands but the break out was slow until the late 60s when mostly California and Southern bands started doing well. Then wham, in 70-71, Hendrix, Morrison, Joplan, Allman died. Light weight pop took over again in the early 70s, then disco and dance music in late 70s. 80s were a resurgance of rock but it seemed more corporate and marketing oriented, big hair bands. Early 90s the grunge rock, bass guitar was interesting but short lived, there is only so much you can get from a bass guitar. Since the mid 90 good guitar rock has been dead.
thats my analysis.