There are two artists using the name Wise Guys 1) An A Cappella group from Cologne, Germany 2) An Italian hardcore band from New Jersey. The Wise Guys was a popular A Cappella group from Cologne, Germany. They were the most prominent representatives of A Cappella music in Germany. Their tantalizing combination of catchy tunes and amusing lyrics have attracted many fans. The group has existed since 1995 with the members Daniel Dickopf (Dän), Marc Sahr (Sari)