Rock Docs (that's Rock Documentaries) have existed for essentially as long as there has been Rock 'n Roll. The reason behind this isn't hard to gage: So much of the music industry takes place out of sight (even more than the movie industry frankly) and the artists behind it are often such unique and interesting people, that the public has such an intense appetite for seeing how they operate. Along the way they've created some interesting stories, unique experiences and even the odd cry for help (oh come on, trying watching The Carter and then tell me that it's not Lil' Wayne isn't screaming for help the entire time). And a spoof of Rock Doc conventions even produced a balls out classic in This Is Spinal Tap (which if you haven't seen you owe it to yourself to see it).
The problem is, when a Rock Doc isn't telling a unique story (Let It Be, Dig) there's really not a lot to be found for people who aren't fans of the musician in question. As much as I love The Promise, I would never recommend it to someone who isn't a fan of Bruce Springsteen. The gist of that rather lengthy opening is that, as much as I like Get Along, if you're not a fan of Tegan and Sara, it's probably not going to appeal to you that much.
Which isn't to say it isn't good, in fact it's quite good. The film is separated into 3 sections. State, a bit on a series of shows where the pair answered questions from the crowd, India, which documents Tegan and Sara's journey to guess-where and For The Most Part, which covers a concert in a slightly closer setting. Like most Rock Docs, much of it is made up of professionally shot concert footage. Of course, since, Tegan and Sara never felt particularly beholden to genre, the effect of the wildly different genres between songs can be interesting. One that stood out to me was when the soft song Call It Off was followed up by the much more rock infused Hell (I like Tegan and Sara, sue me) and the presentation of the two songs opposite each other was unique.
Honestly, I don't know what to say, beyond my opening paragraphs. If you like Tegan and Sara, you'll like Get Along, if not well you SHOULD like Tegan and Sara. So if you are a fan, good for you and it's on iTunes (and Amazon too, I think) so give it a look.
Elessar is a 21 year old cinephile and he found the video of Tegan talking about how much she was inspired by Billy Corgan interesting, given how much better they are than The Smashing Pumpkins.