<P> This song serves as the album's end and features a loud, repetitive melody that builds up, then ends with a very quiet outro . When the main instrumentation ends at 1: 30, the sound of a heartbeat from the first track, "Speak to Me", appears, which appears again in 9 / 8, and gradually fades to silence . </P> <P> Harmonically, the song consists of a repeating 4 - bar chord progression: D, D / C, B ♭ maj7, and A7sus4 resolving to A7 . The bass line is a descending tetrachord . </P> <P> David Gilmour recorded two tracks of rhythm guitar, playing arpeggios, one in open position, and one much higher, around the tenth fret . The lower - pitched guitar part includes the open G and E strings during the B ♭ maj7, resulting in an added sixth and a dissonant augmented fourth . The quartet of female backing singers vary their parts, rising in volume, and echoing some of Roger Waters' lyrics, as the piece builds in intensity . On the last repetition of the chord progression, the B ♭ maj7 leads directly to a climax on D major, resulting in a "brightening" effect (known as the Picardy third), as the aforementioned implication of D minor in the B ♭ maj7 chord shifts to the major . </P> <P> Waters wrote the lyrics on the road for the "Brain Damage" / "Eclipse" closing sequence as he felt the whole piece was "unfinished". The final words sung on the song and, indeed the album The Dark Side of the Moon, directs the listener, "and everything under the sun is in tune, but the sun is eclipsed by the moon ." Waters explained the meaning of these words as well as the entire song by asserting: </P>

Everything under the sun is in tune meaning