This was on Netflix for a while, I've watched it four or five times, and it is WELL worth the watch if you have an Amazon Prime subscription. It's no longer on Netflix in Canada, but might be stateside?
The film is the brainchild of Jason Hook, a Canadian guitarist who is now the dominant lead on songs like "Lift me up" from heavy metal band "Five Finger Death Punch", a band that has managed to not only survive, but thrive in an age where most everything is online, rare for an act with a setlist as hard as theirs tends to be.
Jason's backstory, along with many other very well known names in the music scene, is covered in depth in this documentary which exposes an extremely eye-opening side of an industry where most think anybody who has attained any sort of success is rolling in dough. Quite the opposite for many of these people who were paid a pittance despite giving up a significant portion of their lives to turn their associated acts into what they were. Probably the most appalling and heart-wrenching story is that of Billy Joel drummer Liberty Devito.
Anyways, I don't want to spoil it, so this isn't a full review, but it is well worth the watch if you have the time. It is full of great music as well, as you have some absolutely iconic artists; many of the best of their trade, all collaborating and playing together throughout it.