It was some dime store bargain label compilation that had a track listed as Basie's "Let him Have A Taste" but in actuality was Duke's "Stomp, Look, & Listen", the rowdy Bethlehem one with Cat Anderson screeching like hell at the end, that noise hit a nerve that linked all the horn band, Hendrix, Zappafreakouts that I had been incubating over the last few years...and then once into jazz, screeching big band trumpets soon linked to screeching saxophones like Trane/Ayler/Shepp, and oh hell yeah, I can do this!
Parallel to this was a few vintage Mulligan/Brubeck things. Where the sound of the screech linked to previous tendencies, this stuff was dark in tone, quieter, a whole new consideration. And then, Ellington Indigos & Kind Of Blue, Columbia penetrations.
This all happened really, really fast, like in about 6 months I was obsessed with all of it, any of it, known or unknown, didn't matter. And I pretty much dropped the "popular" musical interests I had had up until then, just stopped caring any more. To this day, most Rock past 1970 or so is of at best secondary, usually tertiary or less, interest to me. R&B, different story, because that link was already there, deeply, and never went away.
I pretty much, to use the vernacular, got turned out by the jazz.