http://variety.com/2014/tv/reviews/tv-review-pioneers-of-television-1201154009/

The problem with this PBS series, says Brian Lowry is that it "suffers from its pigheaded refusal to incorporate voices beyond the actual stars it features, providing a once-over-lightly account that could easily be enriched by incorporating a few behind-the-scenes and third-party voices."
Read more at http://www.hitfix.com/tv-tattle#uUSkPsxFPchBqL4l.99

Watched part of it last night. Thought it was really good. Also proved that if you wanted to make it big you had to go on Johnny Carson.