<Table> <Tr> <Td> "Don't You Know That?" (1981) Don't You Know That? 1981 </Td> <Td> "If This World Were Mine"' (1982) If This World Were Mine'1982 </Td> <Td> "Bad Boy / Having a Party" (1982) Bad Boy / Having a Party 1982 </Td> </Tr> </Table> <Tr> <Td> "Don't You Know That?" (1981) Don't You Know That? 1981 </Td> <Td> "If This World Were Mine"' (1982) If This World Were Mine'1982 </Td> <Td> "Bad Boy / Having a Party" (1982) Bad Boy / Having a Party 1982 </Td> </Tr> <P> Fifteen years after the original recording, Luther Vandross and Cheryl Lynn re-recorded it for her album Instant Love and made the song a R&B top five smash peaking at number four in 1982 on the Billboard Hot R&B Singles chart . </P> <Table> <Tr> <Th> Chart (1982 - 1983) </Th> <Th> Peak </Th> </Tr> <Tr> <Td> U.S. Billboard 100 </Td> <Td> 30 </Td> </Tr> </Table>

Who sings if this world were mine with luther