<Tr> <Td> UK Singles (Official Charts Company) </Td> <Td> </Td> </Tr> <Tr> <Td> US Billboard Hot 100 </Td> <Td> </Td> </Tr> <Tr> <Td> US Mainstream Rock (Billboard) </Td> <Td> </Td> </Tr> <Tr> <Td> US Adult Contemporary (Billboard) </Td> <Td> </Td> </Tr>

Who sings backup on i want to know what love is