Echoes

The piece is structured as a series of evolving movements rather than a traditional song:

A for guitarists trying to replicate Gilmour's tone. More details on the "2001" synchronization theory. Echoes

: The eerie middle segment, often called the "whale song" or "bird section," was produced by Gilmour using a wah-wah pedal plugged in backward to create high-pitched, screaming feedback [11]. The piece is structured as a series of