J. Zach has seen concerts during 14 years.

Year   Concerts Seen  
2022 1 concert
2019 2 concerts
2018 1 concert
2016 1 concert
2015 1 concert
2011 1 concert
2010 1 concert
2008 1 concert
2007 1 concert
2006 1 concert
2003 2 concerts
2002 1 concert
2000 1 concert
1990 1 concert