Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/4
Q:3/4=50
M:6/4
K:C
['G G', 'd d']  
X:1
L:1/4
Q:3/4=50
M:6/4
K:C
 G G G B G G | B3/2 A/B/c/ B G G | c3/2 d/e/d/ B G E | D D/E/F/G/ E C C :: d d d e d d | 
 e3/2 d/e/f/ e d d | e e/f/ g B B/c/ d | A A/B/c/d/ B G G :|  