Jonas Klüver has 4 Casper concerts.

1) Benjamin Griffey, better known as "Casper", is a german rapper from Bielefeld. Casper started writing rhymes as a child while still growing up in Augusta, Georgia. One thing lead to the other and his mother decided to move on out to Germany. After concentrating on his metalcore band for two years, "A Fear Called Treason", he decided to record a hip hop mixtape called "Die Welt hört mich" in 2006. On May 9, 2008, Casper released his first album "Hin zur Sonne" followed by really successful "XOXO" in 2011.