Matt DeTurck’s review published on Letterboxd :
A well-made, interesting documentary about a topic close to my heart.
It must've been an extremely tough edit, and overall the team does a really good job taking a million interviews and combining them with the history of the art form to put together a cohesive documentary. While there are a couple missteps (there's too much time spent on related-but-unnecessary neuroscience, and a "forest" metaphor), overall it's very classy, and a great introduction for anyone not immersed in scores.
I'm excited to dig through the bonus discs, as the "process" and shots of wacky instruments, experimentation, and personal stories are more of what I was after; those were the most interesting parts to me.