In 2002, "As Heard on Radio Soulwax Pt. 2" became the first official mash-up album. Prior mash-ups were bootlegs, never officially released, but Soulwax, and their record label PIAS Recordings, went to great lengths to get clearance for the recordings used in the mixes. The duo originally wished to include elements of 187 recordings, but eventually used 114 of them. 62 were refused permission and 11 could not be traced. The track "Shake Your Body" lacked clearance, as the license owner could not be found. 2ManyDJs included it anyway, because they felt its exclusion would be a waste.