psychedelic music. The piece begins with a slow piano theme in the key of B minor and the voice of an EMI engineer repeating the words "number nine", quickly panning across the stereo channels. Both the piano theme and the "number nine" loop recur many times during the piece, serving as a motif. Lennon later said of the track and its production: Much of the track consists of tape loops that are faded in and out, several of which are sampled from performances of classical music. Works that have been specifically identified include the Vaughan Williams motet O Clap Your Hands, the final chord from Sibelius' Symphony No. 7, and the reversed finale of Schumann's Symphonic Studies. Other loops include violins from "A Day in the Life", and George Martin saying "Geoff, put the red light on". Part of the Arabic song "Awal Hamsa" by Farid al-Atrash is included shortly after the 7-minute mark. There are also loops of unidentified operatic performances, backwards mellotron, violins and sound effects, an oboe/French horn duet, a reversed electric guitar in the key of E major, loud cymbals and a reversed string quartet in the key of E-flat major. Portions of the unused coda of "Revolution 1" can be heard briefly several times during the track, particularly Lennon's screams of "right" and "all right", with a longer portion near the end featuring Ono's discourse about becoming naked. Segments of random prose read by Lennon and Harrison are heard prominently throughout, along with numerous sound effects such as laughter, a cooing baby, crowd noise, breaking glass, car horns, crackling fire and gunfire. Some of the sounds were taken from an Elektra Records album of stock sound effects. The piece ends with a recording of American football chants ("Hold that line! Block that kick!"). In all, the final mix includes at least 45 different sound sources. Album sequencing and release During compilation and sequencing of the master tape for the album The Beatles, two unrelated segments were included between the previous song ("Cry Baby Cry") and "Revolution 9". The first was a fragment of a song based on the line "Can you take me back", an improvisation sung by McCartney that was recorded between takes of "I Will". The second was a bit of conversation from the studio control room where Alistair Taylor asked Martin for forgiveness for not bringing him a bottle of claret, and