<Tr> <Td> April 10 </Td> <Td> </Td> </Tr> <Tr> <Td> April 17 </Td> <Td> </Td> </Tr> <Tr> <Td> April 24 </Td> <Td> </Td> </Tr> <Tr> <Td> May 1 </Td> <Td> "Nothin' on You" </Td> <Td> B.o.B featuring Bruno Mars </Td> <Td> </Td> </Tr>

What was the number 1 song in 2010