Listen to Knock Knock - Horror Spooky Halloween Sound online. Knock Knock - Horror Spooky Halloween Sound is an Unknown language song and is sung by Horror Music Orchestra. Knock Knock - Horror Spooky Halloween Sound, from the album Halloween Classics - The Greatest Halloween Music & Scary Sounds Effects Collection for Halloween Haunted House 2015, was released in the year 2015. The duration of the song is 0:15. Download Unknown songs online from JioSaavn.