Charles E. Bolton , aka BLACK BART aka PO-8 (1828 - ?) electronic 'outlaw' musician It was Black Bart's poetry, though, that really made him famous. With wordplay that is worthy of a 20th century city kid who "tags" subway cars, Bart signed himself "The Po-8". The story goes that Bart was caught when a detective found a laundry marking on a handkerchief he left behind. Bart did some time, but when he got out it was rumored that Wells Fargo paid him money just so he wouldn't rob any more stagecoaches.