Floyd - Echoes - Pink

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

: Around the 7-minute mark, the song transitions into a repetitive, bass-driven "funk" groove. Echoes - Pink Floyd

The band recorded two dozen separate musical ideas, which they initially titled . These included backwards tape loops, experimental riffs, and vocal experiments. They eventually sifted through these, keeping the most promising parts and arranging them into a coherent 23-minute suite. 2. The Famous "Ping" The song's signature opening was born from a happy accident