Hi-Q was a brand and library of production music produced and distributed by Capitol Records in the late 1950s and early 1960s. It was used in several movies and other productions. Perhaps the most notable work to feature Hi-Q music was the 1968 film Night of the Living Dead. The film's producer Karl Hardman used tracks from the library (some of which had been composed specially for the film), and then enhanced them by adding electronic effects, such as echo and reverb; this was unusual as in general production music libraries only permit synchronization rights. Later, a soundtrack for this film was released by Varèse Sarabande, marking one of the few instances in which production music tracks have been released to the public.