M/A/R/R/S' lone single "Pump Up the Volume" remains a watershed in the -hop into dance music and ultimately the pop mainstream. The 1987 single was the brainchild of 4AD chief Ivo Watts-Russell, who assembled M/A/R/R/S' lineup from the ranks of label acts Colourbox and A.R. Kane. The concept behind the single was to fuse the rhythms and beats from classic soul recordings with state-of-the-art electronics and production, complete with scratches by champion mixer Chris "C.J." Mackintosh and London DJ Dave Dorrell. Originally mailed in an anonymous white label to a group of 500 i...