How Pink Floyd Built an Ethereal Drone with Prepared Piano and Odd Meters on 'Set the Controls for the Heart of the Sun'

The whole thing hangs on a single C# minor chord for most of its seven minutes, but the magic is in how they keep it from going stale. Roger Waters plays a simple bass figure in 4/4, while the drums drift between 4/4 and 6/4, creating a lopsided, floating feel. Odd meters aren’t just for show — they make the pulse unpredictable, so the drone never locks into a predictable groove.

The real texture comes from Rick Wright’s prepared piano: he stuck drawing pins into the hammer felts, turning the piano into a metallic, bell-like percussion instrument. That gives the drone a sharp, ringing overtone that blends with the organ and slide guitar. The dynamic swells were achieved by gradually opening the volume on the organ and adding tape echo, making the whole thing breathe. The result is a modal wash that sounds ancient and alien at the same time — a perfect example of Pink Floyd using minimal means to create maximum atmosphere.