Also known as "Ghost Tape Number 10" was an audio mix the US military used for psychological operations in the Vietnam War against the North Vietnamese. It played deeply on the Vietnamese belief of ancestor worship, spirits and the afterlife.The Wandering Soul was played on loudspeakers installed on helicopters, PCF boats or by infantry 'loudspeaker teams' on known enemy areas usually at night deep within the jungle.

"It exploited the belief among many of the Vietnamese people that once a person is dead the remains must be placed in an ancestral burial ground or that person will forever wander aimlessly in space. The tape was so effective that we were instructed not to play it within earshot of the South Vietnamese forces, because they were as susceptible as the Viet Cong or North Vietnamese Army. Wandering Soul' broadcasts of eerie sounds intended to represent the souls of enemy dead who have not found peace (i.e. by being buried in the village family plot)...the idea was that the sounds would at least get a Communist soldier to think about where his soul would rest in the likely event of his being killed far from home." - LTC Raymond Deitch, 6th PSYOP Battalion Commander

"The damn reverb effect of the recording is eerie. I saw and picked-up leaflets and once heard Funeral Music played over the valleys around Landing Zone Mary Ann. A Kit Carson Scout told me what the music was. This was a ghostly sound. Hell, listening to that made me want to Chieu Hoi myself. It must have been effective as hell in the jungle at night." - Unnamed 1st Infantry Division sergeant 1968-1970