Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/4
Q:1/4=120
M:3/4
K:G
['G G', 'd d', 'A A', 'B/ d3/2']  
X:1
L:1/4
Q:1/4=120
M:3/4
K:G
"^Moderate" D | G G G | G/ B3/2 G | A A A | A/ c3/2 || c | B d d | d B G | F A A | A2 |] | D | 
 G3/2 G/ G | G/ B3/2 G | A A A | A/ c3/2 || A | B/ d3/2 G | B/ d3/2 F | A3/2 G/ G | G2 |]  