<Table> <Tr> <Td> </Td> <Td> "The Ballad of the Green Berets" (1966) </Td> <Td> "The' A' Team" (1966) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> "The Ballad of the Green Berets" (1966) </Td> <Td> "The' A' Team" (1966) </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> </Td> <Td> "The Ballad of the Green Berets" (1966) </Td> <Td> "The' A' Team" (1966) </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Td> </Td> <Td> "The Ballad of the Green Berets" (1966) </Td> <Td> "The' A' Team" (1966) </Td> </Tr> </Table>

Who sang the ballad of the green berets