Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/4
M:3/4
K:G
['c A F']  
X:1
L:1/4
M:3/4
K:G
|:"G" G B d | d2 B |"D7" c A F |"G" G/F/ G/A/ G |"G" G B d | d2 B |"D7" c A F |"G" G3 :| 
"D7" D F A | A2 F |"G" B2 G |"D7" c2 A |"G" G B d | d2 B |"D7" c A F |"G" G3 ||"C" g f e | 
"G" d d d |"D7" e d c |"G" B B B |"C" g f e |"G" d d d |"D7" c A F |"G" G3 |]  