6 was the first and only single to be released from Madhouse’s first album 8. It was released one week before the album, marking the first official release of any kind by Madhouse.
The single also contained an edit and an extended version of Six, as well as a non-album track, Six And ½. As with the accompanying album, the single’s name is written numerically (6), while the title track is written in full (Six), although the extended version (6 (End Of The World Mix)) is written numerically.
The single failed to enter the US Billboard Hot 100 Chart, but reached number 5 on the Billboard Hot Black Singles Chart, number 14 on the Billboard Crossover 30 Chart and number 24 on the 12-inch Singles Sales Chart.