<Tr> <Th> Format </Th> <Td> 7" </Td> </Tr> <Tr> <Th> Recorded </Th> <Td> February 1972 at Olympic Studios, London </Td> </Tr> <Tr> <Th> Genre </Th> <Td> <Ul> <Li> Hard rock </Li> <Li> blues rock </Li> </Ul> </Td> </Tr> <Ul> <Li> Hard rock </Li> <Li> blues rock </Li> </Ul>

Who sings the song 30 days in the hole