Echoes - Pink Floyd -

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

: Roger Waters stated the lyrics were an attempt to describe the human potential for empathy . Live at Pompeii Echoes - Pink Floyd

To fit the format of their legendary film Live at Pompeii , the band "put together" a different version by splitting the song into two parts. "Part 1" opened the film and "Part 2" closed it, creating a bookend effect for the performance. The song's signature opening was born from a happy accident

: The eerie, screaming sounds in the middle section were created by David Gilmour reversing a wah-wah pedal. "Part 1" opened the film and "Part 2"