only entering the Dutch charts at #24. Two years later, Vangelis said that the album sold well in the United States. Vertigo also released a single vinyl edition of the album in Brazil, titled Break and leaving out most of the album's instrumental songs. An extended vinyl edition of 666 was released in Greece in 1974, containing alternative mixes of songs with music cut from other versions of the album, in a gatefold sleeve displaying the painting originally on the inner sleeve; some of these versions had appeared on the Brazilian release. Songs The music of 666 is more ambitious and experimental than previous Aphrodite's Child releases, containing greater use of electronic keyboards, studio experimentation, expanded instrumentation, and influences from genres such as jazz, musique concrète and world music. Reflecting this character, only six of the album's 24 songs have vocals and lyrics, four by lead singer Demis Roussos and two by Loukas Sideras. The rest are either instrumental, instrumentals with narration, or use vocals as an instrument. Although the album's material is often acknowledged as challenging and uncommercial, it has also been described as tuneful, "fun", and retaining elements of pop music. Authors Paul Hegarty and Martin Halliwell interpreted the album as reflecting "the turmoil in Greece at the time", while Vangelis argued that its theme was highly relevant in general, stating in Sounds in 1974, "The answer to the question 666 is today." The Mojo Collection argues that "the album's lush arrangements were as startling as any of the progressive era and have aged better than most", in part due to Vangelis not relying excessively on contemporary synthesizers and the prominent role of guitarist Silver Koulouris. Side one The first song on the album, "The System", fades in with a choir chanting "We got the system, to fuck the system!" and a drum roll by Loukas Sideras. The lyric is inspired by Abbie Hoffman's pamphlet Fuck the System. "Babylon" is an acoustic rock song with an energetic guitar riff that Head Heritage compared to Pete Townshend's work on "Pinball Wizard", melodic bass playing by Roussos, and crowd noise similar to that of Sgt. Pepper. The lyrics introduce the apocalyptic theme by referring to the fall of Babylon the Great from Revelation 18. "Loud, Loud, Loud" combines a two-chord piano melody by Vangelis with narration by Daniel Koplowitz, described by a fansite as "the son of [a] diplomat". The