This score is jointly credited to both. In fact, when "More" became pop hit, both names are listed as composers, along with the lyricist.
Does anyone know the story behind this? Did they each work on their own cues and then split credit? Did both indeed contribute to the theme that became "More?"
I don't have an answer, but Oliviero is also responsible for other Mondo movies, such "Mondo cane 2", and "Il Pelo nel Mondo" with Bruno Nicolai, both still on LP. There is also "Una moglie americana" on LP (with a poor LP to CD transfer from Avanz).
Oliviero is not very well known, although his first film records are from 1948, so he was more senior than Riz Ortolani and Bruno Nicolai at the time.