At first, critics reamed them — but hey, that happened to Led Zeppelin too. Grand Funk Railroad persevered through the criticism to remain one of the most popular blues-rock acts of the 1970s; even Homer Simpson is an avid fan. Forty years later, with a couple of breaks in between, the group is still touring as a five-piece, including original members Don Brewer (drums and lead vocals) and Mel Schacher (bass). Playing hits like “We’re An American Band,” and “Inside Looking Out,” their shows are perfect for reminiscing about a time when you didn’t quite fit in either.