Brendan Callahan has seen concerts during 13 years.

Year   Concerts Seen  
2023 1 concert
2022 1 concert
2019 1 concert
2018 1 concert
2017 4 concerts
2016 1 concert
2015 1 concert
2007 1 concert
1997 1 concert
1994 2 concerts
1992 1 concert
1990 2 concerts
1984 1 concert