Mamas Don’t Let Your Babies Grow Up To Be Cowboys by Willie Nelson and Waylon Jennings

This is a classic country tune written in 3/4 time signature.  The first half of the song is in the key of D and is made up of a I-IV-V chord progression.  Chords used are D, G, and A7.  The second half of the song shifts to the key of E.  The chords used here are E, A, and B7.