This song is by Pink Floyd and appears on the Bootleg box set A Tree Full of Secrets (2000). , and was recorded in July 1969. The song has never officially been released and, as such, is only available on bootlegs such as A Tree Full of Secrets (2000)
- "Moonhead" was recorded for broadcast during the BBC's coverage of the first moon landing, titled "But What If It's Made of Green Cheese?"
- Also known as "Trip on Mars"
- Pink Floyd have performed the piece live, sometimes also known as "Corrosion"
- The song is uncredited.