Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
Q:1/8=128
M:4/4
K:C
['g>a g>e']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:C
|: C2 C>E G<G c>A | G>A c>d e<c c<e | C2 C>E G<G c>e | (3(fed) (3(edc) B<d d<e | C2 C>E G<G c>A | 
 G>A c>d e<c c<e | f<a d<f e<g c<e | d>e f/e/d/c/ B<d d<e | g>a g>e g<c c>e | 
 g>a g>e (3(efg) (3(fga) | g>a g>e g<c c>e | (3(fed) (3(edc) B<d d>e | g>a g>e g<c c>e | 
 g>a g>e (3(efg) (3(fga) | (3(gfe) (3(fed) (3(edc) G>c | d>e f/e/d/c/ B<d d<e :|  