<Tr> <Th> Songwriter (s) </Th> <Td> Bob Dylan </Td> </Tr> <Tr> <Th> Producer (s) </Th> <Td> Gordon Carroll </Td> </Tr> <Tr> <Th_colspan="2"> Bob Dylan singles chronology </Th> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> "George Jackson" (1971) </Td> <Td> "Knockin' on Heaven's Door" (1973) </Td> <Td> "A Fool Such as I" (1973) </Td> </Tr> </Table> </Td> </Tr>

Who sang the song knock knock knocking on heavens door