That’s interesting @wharfy. What automatically came up on my TV after the above segment (17 of 23) was the next segment (18), which covers the formation of Crosby, Stills, & Nash, and The Dead’s forays into songwriting and harmony singing (in response to CS&N, as recounted by Jerry Garcia).
Upon a second viewing of segment 17, I noticed the glaring omission of Dylan’s John Wesley Harding album, released in December of 1967, seven months before Music From Big Pink (July of ’68) and eight months before Sweetheart Of The Rodeo (August). The segment chronicles the strain of Rock ’n’ Roll that was a move away from psychedelia, long jams, and very loud volume. John Wesley Harding can be considered the first album of that movement, a radical departure from what was popular in Rock music at the time of it’s release. Dylan again leading the way.