 Whitfield recorded the song with Marvin Gaye over five sessions , the first on February 3 , 1967 , and the final one on April 10 , 1967 . Recordings of this version took more than a month due to Whitfield overdubbing Gaye 's vocals with that of the Andantes ' background vocals , mixing in several tracks featuring the Funk Brothers on the rhythm track , and adding the string section from the Detroit Symphony Orchestra with an arrangement by Paul Riser . 
