There are 2 bands named HKL: 1. Hauptkampflinie (HKL), a hard rock "RAC" band from Germany. 2. A hiphop trio from the Swedish suburb Umedalen. They had great success in both Sweden and in Nigeria because of their great lyrics and nice flow.
Their early songs have often been criticized for the whispering song-technique, but after the song sommaren 2007 that problem was gone and they could start enjoy their success.