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Hmm... Assuming that this reaction is an affirmation from Foraging Rhino, and given the other clues, the remaining red-spined quad title—a singer-songwriter release from Reprise—can only be a few particular titles.
Mingus Moves was NOT released on quad reel, but
Summer Breeze and
Spinners were, so the remaining title must have been released on quad reel. (That also means it must have been a released recording.)
The subject of quad-reel releases is interesting, as
Sail Away by Randy Newman was only released in quadrophonic form on quad reel.
From what I could tell, assuming that the white title is in fact
Summer Breeze (and we all seem to agree the titles include
Spinners and
Mingus Moves), the red-spined title could be one of three releases:
Sail Away by Randy Newman,
View attachment 96346Good Old Boys by Randy Newman,
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Or
Sundown by Gordon Lightfoot
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And these are what the spines look like, if you'd like to compare them side-by-side:
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