Listen to The Heat Is on in Saigon (From "Miss Saigon") online. The Heat Is on in Saigon (From "Miss Saigon") is an English language song and is sung by Lea Salonga, The 'Hey Mr. Producer!' Company and David Campbell. The Heat Is on in Saigon (From "Miss Saigon"), from the album Hey Mr Producer! (The Musical World of Cameron Mackintosh), was released in the year 1998. The duration of the song is 1:40. Download English songs online from JioSaavn.