The genesis of this song goes back to an evening at folk music notable Bert Jansch's house in north London, when fellow acoustic master John Renbourn showed Donovan a D ninth chord. From that Donovan built up a riff that, according to the memories of those present, he then played solidly for the next seven hours. "There was a feeling, even then, that all was not perfect in the Garden of Eden," he said of the song in an interview with Mojo magazine June 2011. "Dealers were moving into bohemia and hard drugs were on the fringes. The song was also prophetic. It was about the bust [his highly publicized arrest for possession of marijuana], although of course I couldn't know that then." Donovan said: "I remember the bass line going down and Mickie saying, 'We've got a problem. The engineers are saying that they can't turn the bass up.' I said, Why? They said, 'Well, it's going into the red.' And so he said to the engineers, 'Look, you go into the red, I'm giving you permission. Go in the red! That's the bass sound I want. Very, very loud.' And they said, 'Well, we'll have to have a meeting.' So they went upstairs and had a meeting about whether the bass should go into the red. And they came down, they said, 'No, I'm sorry, the equipment can't stand it.' So Mickie Most said, 'Look, I've just made a record deal with your boss Clive Davis for $5 million and seven bands. And he's given me $1m right now. So do you think if I phone him up, you'd give me a little bit more bass?' And they looked at each other, and immediately realized that their jobs were on the line. They said, 'OK, you've got more bass.' We got more bass the needle went into the red, the equipment didn't blow up. I guess next time they made that needle, they did that thing by just moving the red bit a bit farther to the right, like in Spinal Tap: 'My amp goes up to 11!'" Donovan does not mention the involvement of Jimmy Page and John Paul Jones. At the time, the two future Led Zeppelin members were popular London session musicians and played on other Donovan sessions, including in 1968 for "Hurdy Gurdy Man". However, their exact contributions, if any, to "Season of the Witch" are unknown.