John Carlson has seen concerts during 19 years.

Year   Concerts Seen  
2024 3 concerts
2023 20 concerts
2022 3 concerts
2021 1 concert
2019 4 concerts
2018 3 concerts
2017 3 concerts
2016 6 concerts
2015 1 concert
2014 3 concerts
2013 9 concerts
2012 3 concerts
2011 3 concerts
2010 2 concerts
2008 2 concerts
2007 1 concert
2006 1 concert
2005 2 concerts
2003 2 concerts