Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/8=232
M:4/4
K:A
['a2 ec de fg af ec', 'ec Bd cA']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:A
|: g | a2 ec de fg | af ec dB Bg | a2 ec de fg | af ec (3(AAA) Ag | a2 ec de fg | af ec dB Bc | 
 Ac (3(efg) ab af |1 ec Bd cA Ag :|2 ec Bd cA AB |: c2 cA d2 dB | ef ec dB Bd | c2 cA de fg | 
 af ed cA AB | c2 cA d2 dB | ef ec dB Bd | Ac (3(efg) ab af |1 ec Bd cA AB :|2 ec Bd cA A ||  