I a going with:
The best music spanned the early-mid 60s thru the early-mid 70s.
American Folk music (Kingston Trio, Bob Dylan), British Invasion (Beatles, Stones, Cream, Led Zeppelin), Folk Rock (Rod Stewart, Eagles, America), Country-Southern Rock (Allman Brothers, Lynyrd Skynyrd, Leon Russell)
......and many, many more styles and performers
Nothing to compare before or after