A Certain Ratio

A Certain Ratio (abbreviated as ACR) are an English post-punk band formed in 1977 in Flixton, Greater Manchester by Peter Terrell (guitar, electronics) and Simon Topping (vocals, trumpet), with additional members Jez Kerr (bass, vocals), Martin Moscrop (trumpet, guitar), Donald Johnson (drums), and Martha Tilson (vocals) joining soon after.

Among the first white indie groups to draw heavy influence from funk as well as disco and Latin percussion, the band were among the first to debut on Tony Wilson's Factory Records in 1979 with "All Night Party," produced by Martin Hannett. 

During ACR's early years with Factory, they scored seven Top Ten U.K. independent releases, highlighted by "Flight" and "Waterline," and released five albums beginning with The Graveyard and the Ballroom (1979).