In his book 'Exotica. Fabricated soundscapes in a real world' the author David Toop writes how Exotica composer Les Baxter's penchant for sound colors found enormous opportunity in horror films:
"Baxter confirmed his enjoyment of this freedom in Soundtrack! 'But horror films, in actual fact,' he said, 'present far less restrictions to a composer because of the extreme range of orchestral color at your disposal. The hardest films to score are those like Born Again where nobody turns into a monster or develops X-ray vision, where there are no ghostly houses sinking into the swamp.'"
Here are some trailers for films mentioned in the Soundtrack! interview.
Goliath and the Barbarians (1959)
Premature Burial (1962)