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Well, the post-Sleeping In A Jar thing is 100% improvisation, in the late 60s-early 70s FZ often had his bands just improvise music on the spot, good examples can be heard at the beginning of "Swiss Cheese/Fire" bootleg (Dec 1971), quite a number of jams on "Imaginary Diseases" and one of my favorites: the Berlin Improvisation from the 9-15-1972 Hot Rats Orchestra live recording. Even the 1973 band occasionally improvised music almost out of nothing.
However, it does seem like the guitar "tuning" thing at the beginning of the Bremen Improvisation (as I'd call it) contains the bass line notes (A-D-G-A-D-G-A) for "Pound for a Brown", so FZ might've used the Pound bass-line in deadly slow rubato for kicking off the improvisation. But yeah, quite an interesting and mellow improv, it does prefigure all those post-rock bands a la Godspeed You Black Emperor three decades later. It also contains a rare glimpse of FZ playing the piano during performance.
What FZ wanted to do was to write not so much songs anymore, but to compose some kind of electric chamber music. The elaborate percussion and winds were definitely more prominent after the first three (well, the first four, if you also count the doo-wop music collection "...Ruben and the Jets") Mothers albums. By 1968 he definitely had got more virtuosi in his bands, people like Bunk Gardner, Ian Underwood and Arthur Tripp could really read music and play tons of instruments and thus give FZ a chance to record some of his more elaborate instrumentals.
And get this: in 1969 at Fillmore East, he represented what was in fact a rather controversial piece of music: "Electric Bassoon Concerto". Written for electrified bassoon, clarinet, flugelhorn as well as percussion (and even featuring a guitar solo), it was FZ' attempt at making new sort of classical music with a rock-ish backbeat. However, critics hated it (and called it, to prove that rock journalism and true intelligence are mutually exclusive, "Oboe (sic!) Concerto"!) and I don't think most of the Fillmore audience dug it either. The Groupie Opera with two tenor/alto male vocalists* this was not! He had some more music for winds and percussion, but eventually FZ disbanded the original Mothers, partially because of uneven musicianship in the band and partially because others just didn't get his radical approach (and he was in debt because of the high cost of touring and not getting enough money from concerts).
*Referring of course to the "Fillmore 1971" live album with the Flo & Eddie period Mothers singing bawdy and slapstick lyrics about groupies. Ostensibly, FZ shifted back to a bit more mainstream pop sound in 1970 and reserved his orchestral ambitions for "200 Motels" movie. Clearly he didn't see the expected results to playing chamber music for three horns and percussion.
_________________ Lies are like quicksand, soft and comfortable, but they will swallow us. Truth is like bedrock, hard and uncomfortable, but we can always stand on it
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