Sorry to post a non reggae question in here but I've had no luck on other forums and I seem to remember there's some "right clued up geezers & geezettes" on BAF.
The question :
Back in 1992-3 , Future sound of London recorded / played a lot of long ambient sets using a very eclectic mix of sounds from dub to film soundtracks. Featured throughout MANY of these sets was a horn solo which I think was either Miles or Charlie Mingus. I seem to remember it being quite a "famous" track , very melancholic.
You say horn - do you mean trumpet or sax? Either way, you could try googling Future Sound of London with names of horn players - eg: John Coltrane Miles Davis Eric Dolphy and all the other horn players from Mingus and Miles' bands....! Rob