Carl Isonhart has seen concerts during 12 years.

Year   Concerts Seen  
2019 1 concert
2018 3 concerts
2017 1 concert
2016 1 concert
2014 1 concert
2007 1 concert
1998 1 concert
1995 1 concert
1992 1 concert
1988 1 concert
1987 1 concert
1983 1 concert