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.

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

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"

"Echoes" was essentially a giant musical puzzle that Pink Floyd pieced together from 24 separate fragments. When they started recording in January 1971, they had no finished songs, so they spent studio time experimenting with random musical ideas. Here is how they "put together" the masterpiece: 1. The "Nothing" Fragments