Not sure if my example counts, but: I first knew of Dave Grusin from his jazz albums, and as a young person teaching himself about jazz, I instinctively knew that I should avoid them. (Jazz was in a weird place in the late ’70s/early ’80s.)
It was only decades later that I learned he wrote the themes to The Girl from UNCLE, The Name of the Game, and It Takes a Thief. And then I heard his scores to Three Days of the Condor, Friends of Eddie Coyle, The Yakuza, the Scorpio Letter, and Assignment: Vienna, and that was it.
I now consider Dave Grusin to be one of the prime architects of late-1960s/early-1970s Hollywood film- and TV-scoring, and rank him with up there with Q, Lalo, Jerry Fielding, and all those other cats.
But I’m still afraid of his jazz albums!