The lyrics are briefly referenced in the film "Pink Floyd – The Wall", when the protagonist, Pink, is caught writing poems in class by his teacher. The teacher snatches the poem book from him and reads it in a very sarcastic, demeaning manner, practically encouraging Pink's classmates to laugh. The poem is a verse of lyrics to "Money". "Money interested me enormously," Waters remarked on the twentieth anniversary of "Dark Side". "I remember thinking, 'Well, this is it and I have to decide whether I'm really a socialist or not.' I'm still keen on a general welfare society, but I became a capitalist. You have to accept it. I remember coveting a Bentley like crazy. The only way to get something like that was through rock or the football pools. I very much wanted all that material stuff." The demo tracks for the song, including some of the sound effects, were recorded in a makeshift recording studio Roger Waters had in his garden shed. As recorded by the band, the song has a "bluesy, transatlantic feel", unlike Waters' original demo version, which he later described as "prissy and very English". As heard on "Classic Albums: Pink Floyd – The Making of The Dark Side of the Moon", the demo is in the key of G-sharp minor, as opposed to the B minor of the final version. The instrumental jam was a collaborative effort, with Gilmour overseeing the time change as well as his own guitar and vocal work, and Richard Wright and Nick Mason improvising their own parts. Dick Parry contributed the tenor saxophone solo that precedes the guitar solo. Gilmour's input is also discernible in the final mix, which features contrasting "wet" sections, with thick reverb and delay effects, and "dry" sections. In particular, during the second chorus of the guitar solo, all the reverb and delay effects are suddenly pulled out, creating a much smaller and more intimate virtual space. To produce the distinctive piercing high notes that distinguish the final chorus of his solo, Gilmour played a customized Lewis guitar with twenty-four frets, allowing a full four-octave range. One of the most distinctive elements of "Money" is the rhythmic sequence of sound effects that begins the track and is heard throughout the first several bars. This was created by splicing together recordings Waters had made of clinking coins, a ringing cash register, tearing paper, a clicking counting machine and other items to construct a seven-beat effects loop.