This arrangement of Old MacDonald Had a Farm is written in the key of concert D, so that all string instruments can play the song together. Select a link below for a free printable PDF of the song for your instrument. If you are looking for the piece in a different key, would like to see the chords for the song, or would like to find out about its history, visit the main Old MacDonald Had a Farm lead sheet page. The band arrangement of Old MacDonald Had a Farm is in the key of B flat, so if you want to combine string instruments with woodwinds and brass, select your desired key on that page. To determine the correct key for transposing instruments, visit the transposition chart page.