Hi_Tack is an electronic group hailing from The Netherlands consisting of two Dutch producers named Koen Groeneveld and Addy van der Zwan, formed in 1996 as Klubbheads. They also used a lot of other aliases such as Code Blue or Greenfield. Their most successful single to date is a remix of Paul McCartney and Michael Jackson's song, Say Say Say. They remixed it and released it in 2006 entitling it Say Say Say (Waiting 4 U). In late summer of 2007, Hi_Tack released a new single; Let's dance.