Frankly, the widest swath of musical brilliance & diversity to have ever happened in maybe all of human history was happening all over the 1960s.
You obviously have very wide ranging developments in rock & roll, British invasion, Haight Ashbury etc... Nearly every divergence of the art form began then. The Stones, The Doors, The Beach Boys, The Beatles, Hendrix, Joplin. It was an explosion of different styles, coming from all over the place, like someone knocked over a fire hydrant, & a rainbow of pop/rock spewed out, even giving birth to Led Zepplin, Black Sabbath's infancy of Heavy Metal, Genesis, Yes, & the birth of prog rock. You can go on endlessly
Then there's the expressionistic intellectual exploration of jazz music by Coltrane, Charlie Parker, Miles Davis, etc... True virtuosic craftsmen wandering the unknown landscape of improvisation, & even fusion with modern pop/rock elements. Plus, a resurgence of appreciation for the old jazz styles, with Tony Bennett, Bobby Darin. Ella Fitzgerald, & Sinatra, still going strong. Heck, Louis Armstrong, after years of being forgotten, had one of his biggest hits in 1967.
Country music was having one of its biggest upheavals, Johnny Cash, Waylon Jennings, Merle Haggard, a grittier, more powerful style of music than had ever been attempted in the genre. So too the women of country hitting their stride with deeply personal music that hit people right where they lived, Patsy Cline, Tammy Wynette, Dolly Parton, Loretta Lynn, etc...
Even Folk music was having its heyday, with Bob Dylan, Joni Mitchell, Arlo Guthrie, Simon & Garfunkel, Joan Baez, etc... Music was just permeating every aspect of American culture, from every walk of life, in an almost incalculable amount of ways. The artists didn't even know wtf was going on. ELVIS & RAY CHARLES HAD COUNTY ALBUMS!
The Rhythm & Blues movement blasted onto the scene, Motown, soul, funk, etc.... James Brown, Aretha, Tina Turner, The Supremes, Marvin Gaye, Sam Cooke, Stevie Wonder, Ray Charles, etc... Nobody even knew what to do with it all. Reggae popped up with Bob Marley & the like. Movie musicals came back, Streisand, Julie Andrews. Judy Garland had a tv show! & her musical director was MEL TORME. Everyone thought civilization might come to an end, & they ALL wanted to have a say in their art.
Jesus, there was even masterful CLASSICAL music still being composed, by the likes of Stravinsky, Shostakovich, Aaron Copland & Leonard Bernstein, men still invested in the grand forms from which all Western music had originated. Never in all of human history was so much going on in music. It's taken me half a lifetime to study the musical goings-on of that decade which preceded my birth