<Tr> <Th_colspan="2"> Music video </Th> </Tr> <Tr> <Td_colspan="2"> "Must Be Doin' Somethin' Right" at CMT.com </Td> </Tr> <P> "Must Be Doin' Somethin' Right" is a song written by Marty Dodson and Patrick Jason Matthews, and recorded by American country music singer Billy Currington . It was released in May 2005 as the first single from Currington's album Doin' Somethin' Right . The song reached the top of the Billboard Hot Country Songs chart . </P> <P> The song is in the key of A major, with a main chord pattern of F ♯ m-D-A on the verses . In it, Currington sings that he "must be doin' somethin' right" in the relationship with his lover . </P>

Who sings the song must be doing something right