Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/4
M:2/2
K:G
['d d']  
X:1
L:1/4
M:2/2
K:G
 d | d d d c | B c d2 | A B c2 | A B c c | d d d c | B c d3/2 d/ | A3/2 A/ A3/2 B/ | A G G ||  