Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:D
['', 'FA (3ABA', 'gbag fdef d3 e :|2 fdfa bbag']  
X:1
L:1/8
M:4/4
K:D
 A |: FA (3ABA Bddg | fAdf efdA | FA (3ABA GBde |1 (3fed ef dBAG :|2 (3fed ef d3 e |: 
 (3fed af g2 bg | faag fedd |1 (3fed af gbag | fdef d3 e :|2 fdfa bbag | fedc d3 ||  