What type of details about robert pete williams can be gathered from the following bio? Bio: robert pete williams -lrb- march 14 , 1914 -- december 31 , 1980 -rrb- was an american louisiana blues musician . his music characteristically employed unconventional structures and guitar tunings , and his songs are often about the time he served in prison . his song '' i 've grown so ugly '' has been covered by captain beefheart , on his album '' safe as milk '' -lrb- 1967 -rrb- , and by the black keys , on '' rubber factory '' -lrb- 2004 -rrb- .
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