There is more than one artist with this name: 1) カレン, Japanese visual kei band.
2) カレン, Japanese enka singer. 1. カレン was a Japanese visual kei band that formed on December 1st, 2001. They had their first live on March 23rd, 2002.
On August 17th, they performed at an event that had been organized by the label Matina, handing out their first demo tape "Solve" for free.