Output a stream of consciousness before answering the following. Passage: "Season of the Witch" is an early example of psychedelic rock, written by Donovan and Shawn Phillips. It was released in September 1966 on Donovan's Epic Records (USA) album, Sunshine Superman.

Question: Based on this passage, who sang must be the season of the witch?
The relevant information is: It was released in September 1966 on Donovan's Epic Records (USA) album, Sunshine Superman.
The answer: Donovan.