This was a down year for me, but, for my money, the best shows of 2015 were (roughly in this order):
2015/06/09 Florence + The Machine @ Merriweather Post Pavilion -- just stands out as the best performance of the year
2015/09/27 The Jesus and Mary Chain @ 9:30 Club -- most memorable show, electrifying
2015/02/10 Glen Hansard @ Lincoln Theatre -- he performed for nearly three hours, and it still felt like it wasn't enough!
2015/07/10 The New Pornographers/Thao & the Get-Down, Stay-Down @ 9:30 Club -- left this show with the biggest smile on my face
2015/10/29 Garbage @ 9:30 Club -- surprisingly, remarkably fun show; the crowd was really into it
2015/02/24&25 Sleater-Kinney @ 9:30 Club -- it's Sleater-fucking-Kinney, baby!
2015/03/04 The Juliana Hatfield Three @ Black Cat -- exceeded my expectations by a wide margin