"Let 'Em In" is a song by Wings from which 1976 album, it's the fifth studio album by Wings, released on 25 March 1976 as a follow-up to their previous album "Venus and Mars"? 
Wings at the Speed of Sound: Wings at the Speed of Sound is the fifth studio album by Wings, released on 25 March 1976 as a follow-up to their previous album "Venus and Mars".
i don't know