I'm wondering how iny mind that I've always had Oliver Nelson attached to this session as arranger. I don't see his name on the original LP, but... it's in Discogs, and maybe enenin the ZDB review? So where did his name get added?
Per https://quartetrecords.com/product/last-tango-in-paris/
The successful album released in 1972 by United Artists Records was in fact a re-recording made in New York with great musicians, and a real gem in terms of sound recording. It was first released on CD in the mid-nineties by Ryko, who added to the album about 25 minutes from the original film recording in mono (Varèse Sarabande reissued this same program a few years later). For this edition, we have been fortunate to find the original 8-channel multi-tracks with the complete original film recording, made in Rome.
Listening to all the material prepared by Barbieri for the film (orchestrated and conducted by Oliver Nelson)—an hour of music on 49 different tracks (of which Bertolucci used only about twenty minutes)—adds a wide perspective to this marvelous score heard for the first time in pristine stereo sound.