Music. According to Sohu's query. The song "The Monk Riding Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock Knock The tune is lively, concise and cheerful, and easy to learn and sing. It is especially popular in The Journey to the West and is welcomed by children.