“Planet Caravan” is a song by the English rock band Black Sabbath. Geezer Butler has stated that the song’s meaning is floating through the universe with one’s lover. The lyrics to the demo version as available on the Special Edition reissue of Paranoid were ad-libbed by Osbourne about an outing in the woods. The song appears on their 1970 breakthrough album Paranoid. Lead singer Ozzy Osbourne uses a Leslie speaker to achieve the vocals’ treble and vibrato effects. The piano parts on the track were played by album engineer Tom Allom. Iommi overdubbed fluteto the reversed multitrack master which was then re-forwarded and treated with stereo delay.
The Leslie speaker is a combined amplifier and two-way loudspeaker that projects the signal from an electric or electronic instrument, while modifying the sound by rotating the loudspeakers. It is most commonly associated with the Hammond organ, though it was later used for the guitar and other instruments. A typical Leslie speaker contains an amplifier, and a treble and bass speaker—though specific components depend upon the model. A musician controls the Leslie speaker by either an external switch or pedal that alternates between a slow and fast speed setting, known as “chorale” and “tremolo“.