Two instrumentals of that era were seminal in my musical growth: East--West by the Paul Butterfield Blues Band, and Invocation and Ritual Dance of the Young Pumpkin. Both reshaped my notion of what a guitar solo and improvisation should be. Of course, we also made a point of memorizing all the lyrics to the MOI albums. "I remember too-too, I remember too-too, they had a swimming pool".
There is an accompanying video tour of Frank's office and workspace by Joe Travers, that includes a zoom-in on a letter of condolence Bill and Hillary Clinton sent to Gail after Frank passed. Typical of the pre-e-mail era, the letter has the Zappa's street address on Woodrow Wilson Drive in Los Angeles, so you can check it out on Streetview. Nice neighbourhood. Lush and green.
As I've noted here before, I had the pleasure of meeting and briefly interviewing Frank mid-August, the weekend of Woodstock. Two days later, he broke up the band, noting in the Montreal Star (where I first read about it on the Monday morning) that he said he was doing so because "people wouldn't know good music if it bit them on the ass". The band members I spoke with at the time noted that it had been a fairly grueling tour. A month and a bit after that, he released Hot Rats. Given how productive he was, and his penchant for constantly recording things (as the vault tour amply illustrates), I have no idea how long that album had been in the works, or whether it resulted from the band breakup.
Though the theme of Trouble Every Day remains true, the phrase "They'll send some joker with a Brownie, and you'll see it all complete" is likely not as transparent to millenials and younger. A "Brownie" was the cost-effective (i.e., cheapest) film camera marketed by Kodak; the lyric implying that newsmedia would send some junior reporter to cover such riots and take a few pictures.