<Li> Richard Kniss--double bass </Li> <Li> Gary Chester--drums, percussion </Li> <Table> <Tr> <Th> Chart (1971) </Th> <Th> Peak position </Th> </Tr> <Tr> <Th> Canada Top Singles (RPM) </Th> <Td> </Td> </Tr> <Tr> <Th> Canada Adult Contemporary (RPM) </Th> <Td> 5 </Td> </Tr> <Tr> <Th> Canada Country Tracks (RPM) </Th> <Td> 17 </Td> </Tr> <Tr> <Th> US Billboard Hot 100 </Th> <Td> </Td> </Tr> <Tr> <Th> US Adult Contemporary (Billboard) </Th> <Td> </Td> </Tr> <Tr> <Th> US Hot Country Singles (Billboard) </Th> <Td> 50 </Td> </Tr> </Table> <Tr> <Th> Chart (1971) </Th> <Th> Peak position </Th> </Tr>

Who sang backup on john denver country roads