Hey Tim, did you find a documentary on YouTube or something? I saw a few things in there but I didn't have time to scope everything out. I guess you did!
What I remember learning about Captain Beefheart back in the day was, all the musicians in his band were completely untrained when they got in the band -- he wanted it that way, because he wanted no musical influence besides his own. They had some great names too, like Zoot Horn Rollo and Drumbo LOL. I think he didn't want anyone with real names as well as real chops LOL
During the time we were in the Martian Entropy Band, Captain Beefheart came out with what I think was his most commercial venture, ever -- the CLEAR SPOT album. I actually LOVE that album. The title song is the bomb -- " I HAD TO RUN, RUN, RUN, RUN, RUN TO FIND A CLEAR SPOT". Other notable titles on that album include a BEAUTIFUL ballad (and one of my all time favorite songs) called "My Head is my Only House Unless it Rains".
and let's not forget that Entropic masterpiece on the same album -- "Big-Eyed Beans From Venus" -- DON'T LET ANYTHING COME BETWEEN US! LOL
Of course Don Van Vliet (Captain Beefheart) also did the vocals on Zappa's "Wille the Pimp" from the Hot Rats album. I recently read somewhere that Van Vliet has claimed that he actually wrote those words, whereas Frank Zappa took the credit for composing them.