I mostly agree the 50's + 60's were some of the greatest music of all time. But you can't overlook the 40's Big Bands and late 30's Jazz. Both predecessors of Rock-n-Roll. Jazz more than Big Bands. Certainly in the 60's when the bands started writing their own songs and recording them is when it really got good. The Beatles, Bob Dylan, The Who, etc. Trendsetters IMHO.