Echoes - Pink Floyd | Instant

The song's signature opening was born from a happy accident. Keyboardist Richard Wright played a single high note on a grand piano that was accidentally fed back through a . This created the famous "underwater" sonar sound that defines the track's intro. 3. Collaborative Writing

: The eerie, screaming sounds in the middle section were created by David Gilmour reversing a wah-wah pedal. Echoes - Pink Floyd

: Around the 7-minute mark, the song transitions into a repetitive, bass-driven "funk" groove. The song's signature opening was born from a happy accident