<P> The main theme features what were, for Pink Floyd, rather unusual chords . In the final version's key of D minor, the chords are D minor ninth, E ♭ maj7sus 2 / B ♭, A sus2sus4, and A ♭ sus2 (♯ 11). All these chords contain the tonic of the song, D--even as a tritone, as is the case in the fourth chord . </P> <P> The song fades in with an acoustic guitar in D tuning strumming the chords with a lively, syncopated rhythm, with a droning Farfisa organ playing chord tones (A, B ♭, A, and A ♭, respectively). After the first sixteen - bar progression, Gilmour begins the vocal . For the third repetition, bass guitar, Hammond organ, drums and lead guitar (playing a subtle drone of D) enter . After this repetition comes the first of several guitar solos, played by Gilmour on a Fender Telecaster rather than his usual Fender Stratocaster . Next is another verse of lyrics, followed by a keyboard solo . Finally, after six repetitions of the main theme, the tempo is cut in half, dramatically slower, a new chord progression is introduced, resolving gradually to the relative major, F, with two lead guitars loudly playing a slow harmonized melody, and a quieter third guitar adding decorative string bends, with heavy use of reverb and echo . </P> <P> The song is then stripped back down to acoustic guitar, droning on the Dm9 chord, with the bass softly striking E, the ninth of the chord, in the same range as the guitar's lowest note, D. Another slash chord movement follows, B ♭ to C / B ♭, followed by the key's dominant, A Major, with the minor sixth heard first at the top of the chord, in an A (add ♭ 6), and later, as its bass note (in a progression of A, A / F, A / E, to D minor). After another guitar solo over the new progression, Gilmour sings a melismatic vocal with overdubbed harmonies from Richard Wright, ending with the lyric "Have a good drown / As you go down / All alone / Dragged down by the stone", as the dissonant A / F leads back to Dm9 . </P> <P> The middle section, in a slow, metronomic 6 / 8 time, is built upon several layers of synthesizers, sustaining the four chords of the main theme, with the sound of dogs barking processed through a vocoder and played as an instrument . Gilmour's last word, "stone", echoes slowly for many measures, gradually becoming distorted and losing its human character, before fading out (It reappears later in the instrumental section of "Sheep"). There are no guitars in this section . Gradually, a synthesizer solo emerges, and as it reaches its climax, the acoustic guitar returns, at the original tempo, once again lively and syncopated . </P>

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