Not all the documentaries are on the same depth level, but generally speaking is one of the best series on any subject, in the whole... Some are excellent movies, and above all I place the piece by Wim Wenders: I quite believe the man is really a better documentarist than a 'movie' director; I mean, watching his film on blues, using actors and cinematography at the highest level, you forget about documentary, and just feel like you're watching ages lost films (just to contradict my first statement about this director: but I'm also thinking about the excellent Tokyo Ga from the same man!). Besides he is the one who is most successful, in my opinion, in communicating the great love he feels for this music and for the 'heroes' involved: well, he is also the most experienced director on this kind of subject, after his other great 'film' Buena Vista Social Club. In general the other documentaries are quite informative and well made too, but I also sense a kind of 'lack of a styling signature' from such otherwise GREAT directors (Eastwood and Scorsese above all); given that, surely it's worth seeing and hearing this whole piece of work.