It's not so much a documentary, insofar as it dwells on a certain phenomenon or event, presenting facts and subjective views, making the audience more well dispersed in the subject, as it is a bunch of old and contemporary musicians recording of music on ancient equipment. That's really all there is to this film, and that makes it pretty awesome. While some musicians, like Beck, really thrive in environments such as this, others, like some generic rapper, probably should stick to more modern ways of recording sounds.
It's fun to watch Jack White's unending enthusiasm for the techniques, and to witness Steve Martin not talk, not even sing, just sit there playing awesome banjo while Edie Brickell does the vocalising.
With few exceptions, the music is brilliant (where can I buy the soundtrack?) and the 2.5 hours feels much shorter.
Passed the Bechdel test
4 violins of 6