The Deff Boyz was a studio project of British producer Paul Hardcastle (born December 10, 1957 in London).
Because it had contractual problems in 1990, Hardcastle was temporarily unable to publish under its original name. Therefore, he created the project The Deff Boys and hired for the singer Tony Mac. Launched in July 1990 in the United Kingdom, the dance / house single swing rose to the end of the month in the English hit parade and reached rank 84. A month later, the song climbed to 27th place in Germany, in the US ranked number 18 in dance music / Club Play Singles. Swing remained the only hit Hardcastles under this name.