UCLA's ethnomusicology department has released a video from March 1992 when James Horner spoke for an hour.
This historic document begins with a short introduction by Professor Steve Loza and an intervention of Scott Lipscomb.
James Horner starts talking at 00:19:16.
The composer explains the following topics:
His career, his work for Roger Corman, why he has chosen film music, how to get hired on a movie, how the Oscars operate, handling directors who are too close to their temp tracks, orchestrating on his own vs assigning an orchestrator, his work on Aliens, working within Hollywood where each idea has to be unique (the well known opinion about series of paintings for different clients), comparing film composing to Haydn being a court composer, Mozart writing for his employers and so on, ghost writing in Hollywood …
Thank you to Karim (Karelm on the jwfan.com forum) for this find, and to Nick Martin, Tom Hudson, Olivier Soudé and Kim Østenfor Spildrejorde for their help.