Sometimes I tell myself things like - I don't like country, I don't like folk, so hadn't really given good listens to the twin '70 Americana classics Workingman's Dead and American Beauty. This was a grave mistake.
* Seriously, I think I did this because I tended to listen more to certain years - '77, '73, '72, '74, etc. MOSTLY live, but when studio, generally from the run of albums starting with their new label in '73 - Wake of the Flood, Mars Hotel, probably my favorite studio title Blue For Allah, Terrapin (controversial for being too slick and overproduced to some fans taste, but led to some great streamlined, leaner and meaner live versions) and the vaguely disco-y Shakedown Street. Not much (studio or live) after '78. Not much studio before '73. Though I just listened again to early albums like Anthem For The Sun, Aoxomoxoa, Live/Dead (as well as Workingman's Dead and American Beauty - next in sequence live albums Skull and Roses AND Europe '72 are on deck) and liked them all more than I remembered. OVERALL, I confirmed still tending to prefer the '72-'78 material from their canon or body of work (but WD and AB being a dual revelation). Particularly '74 more than '72, probably '73 even more and maybe '77 most of all. They took an extended hiatus from touring in '74 for several reasons, mostly because the best in the world but staggeringly expensive "Wall Of Sound" (and ancillary personnel needed to move the acoustic infrastructure around the country) was rapidly getting out of control and becoming an albatross, but also so Jerry Garcia could edit down a feature length live concert film from over 125 hours of concert footage, culled from about a five night Winterland run that preceded their self-imposed exile from touring - it didn't premier until '77, with Garcia's debilitating combo of perfectionism/inexperience leading to a glacial, multi-year editing pace, making Terrence Malick look like Roger Corman in comparison. Though it turned out great and was well worth the wait, so there's that. They only performed like four shows in '75. I'm not as well versed on their shows in '76 and '78 (but have heard excellent material from both years).
** One reason I'm drawn to the '73 album Wake of the Flood (and the run of albums through Shakedown Street that started with it) and the Grateful Dead movie which was again shot in '74 but not released until '77 is the song Eyes of the World, which is featured in both. Despite much prior exposure from a good friend that was a devoted Dead Head, that was the first song where I had an aha moment and felt like I "got" the band and their sound. What appealed to me and broke through the previously long standing indifference was the jazz-like improvisational soloing and interplay (actually, at times a kind of everybody solos ethos and MO like fusion groups such as Weather Report, or to put it differently, to interweave multiple musical lines almost like a Bach fugue, lending a richness and complexity highly atypical of the rock genre). That seemed to be an oft-cited stylistic hallmark of '73, this jazz-type improvisation. They certainly retained that in later years like '74 and '77 that I'm familiar with, but that is perhaps when it became more pronounced (and arguably unsurpassed). Other reasons why some might gravitate to certain eras or others (because they do have a massive body of work, I think more concerts than any group in history, and it is hard to listen to EVERYTHING, I have tried to at least sample many eras, including from the beginning, at least through '78): a preference for when favored songs debuted, personnel changes (Pigpen had his own kind of musical gravitational force before passing at a shockingly young 27 from liver failure complications in '73, and much of his most famous material was steeped in genres like soul and R & B, I actually preferred what keyboardist Keith Godchaux brought to their collective, ensemble sound, such as his classical and jazz background - his tenure, roughly coinciding with his background singer wife Donna {{as well as my favorite chunk of the Dead's body of work}}, spanned from a little before '72 and after '78), certain instrumental tonalities (Garcia used a heavily phased guitar effect called a Mu-Tron circa '77 and possibly later, which meshed perfectly with the demented, jagged, off-kilter time signature and fractured beat/groove of Bob Weir's hybrid reggae vehicle Estimated Prophet), etc.
*** Eyes of the World excerpt from Grateful Dead Movie (VIDEO 7 minutes)
https://www.youtube.com/watch?v=QZwdf4y1b4M
Workingman's Dead (AUDIO 73 minutes)
https://www.youtube.com/watch?v=sJhIG8wc3Ok
American Beauty (AUDIO 42 minutes), note some of the prettiest pedal steel guitar work in the history of rock music, Garcia had few if any peers on the instrument at the time among his rock lead guitarist cohorts - I think band friends CSN (& Y?) "traded" his playing on one of their albums for lessons in their famous multi-part vocal harmonies, which the Dead did improve in over time.
https://www.youtube.com/watch?v=-voC5IrYeAA
Pedal steel can also be heard on his '72 solo album debut, Garcia, which also included future band classics such as Deal and Sugaree (AUDIO 40 minutes)
https://www.youtube.com/watch?v=VqauQmyDxjc