Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:4/4
K:G
['', '(3AAA Ac e2 ef gedB', 'agef (3ggg ga gede (3aaa ag agef', 'eABA d3 B GABd', 'aece gdBd gdBd aece a3 f gedB']  
X:1
L:1/8
M:4/4
K:G
 G |: (3AAA Ac e2 ef | gedB GBdG | (3AAA Ac e2 ef | gedB eAAG | (3AAA Ac e2 ef | gedB d2 g2 | 
 edeg a2 ba | gedB B{d} A A2 ::{g} a3 g agef | (3ggg ga gede | (3aaa ag agef | gedB BA A2 | 
 agef gage | d3 B GABd | (3cBA BA Bdef | gedB B{d} A A2 :: eABA eABA | d3 B GABd | eABA eAAf | 
 gedB B{d} A A2 | eABA eABA | d3 B GABd | (3cBA BA Bdef | gedB eA A2 :: aece aece | gdBd gdBd | 
 aece a3 f | gedB B{d} A A2 | agef g3 e | dedB GABd | (3cBA BA Bdef | gedB eA A2 :|  