<Table> <Tr> <Td> Medieval </Td> <Td> c. 500--1400 </Td> </Tr> <Tr> <Td> Renaissance </Td> <Td> c. 1400--1600 </Td> </Tr> </Table> <Tr> <Td> Medieval </Td> <Td> c. 500--1400 </Td> </Tr> <Tr> <Td> Renaissance </Td> <Td> c. 1400--1600 </Td> </Tr> <Tr> <Th> Common practice </Th> </Tr>

Which of these is not considered an important 20th century english composer