Madan Mohan, Khosla’s music director this time, created some of his career best tunes for Woh Kaun Thi and those songs have remained ever popular. Being a true follower in Guru Dutt and Dev Anand tradition, Raj Khosla had developed his skill in deriving the best out of the music directors he worked with. This skill stayed with him almost all his career.
Woh Kaun Thi was another feather in the cap of Khosla as he held the audience attention by deftly maintaining palpable suspense all through the film and balancing Sadhna’s different roles. He was now an all-rounder film maker. Somehow, the eerie ghost films in India run well only when they have good music for the ghost (the fleeting Lady in White) to sing. Raj mastered this skill well enough which was evident in the engaging song picturization of Woh Kaun Thi.