[Andy]

The way that DSOTM is structured it is almost like a mini-symphony. The opening, 'Speak to Me', is the album's overture, with some of the main sound effects (talking, which runs through the whole album; the screaming Clare Torrey, who does it again in 'The Great Gig in the Sky')and the heartbeat, plus the aural explanation of the theme of the album. Actually if you listen, the heartbeat goes from the start of 'Speak to Me', then into 'On the Run', and then when the chiming guitar chords play at the start of 'Time'. The REPEATING of ideas is one of the main points of composition.

The cash register effects are in 'Money' (which was introduced in 'Speak to Me'). The heartbeat reappears in 'Eclipse'. It's a very cleverly constructed group of compositions that relate to a theme. Therefore it is a concept album. Ergo, it is also progressive.