Peart is a philosopher first, drummer second. Satre was much the same, except he blew a mean harmonica, but got kicked out of his band for engaging the audience in too many debates as to whether the harmonica existed. This worried the banjo player , who kicked him out, as he was worried that Satre might ask if banjos should exist, and we know that the answer is no.
Marx's band failed as "from each, according to his abilities, to each according to his needs" doesn't work with a singer in the band, as their apparent needs are infinite. Great jazz vibes player, though, and Schoenberg's original inspiration for twelve tone music was Marx's interpretations of standards.
Maynard Keynes was asked to play bass in the first version of the Sisters of Mercy purely on the basis of the statement "in the long run we're all dead" which was sufficiently gloomy to fit the ethos and was one of Eldritch's inspirations to form the band when he was studying for a combined degree in Economics and Misery at Leeds University (it was 1970s UK, so miserableness was very popular). He failed the audition, though, due to having already been dead for thirty years which had significantly reduced his bass playing chops.