Produce music using the specified musical structure depicted in letters along with the provided musical theme.
X:1
L:1/8
M:4/4
K:D
['D>FA>d B>GE>C D2 E>F (3GFG A>F', '(3GFG B>A']  
X:1
L:1/8
M:4/4
K:D
|: (3ABc | d>AF>E D>FA>d | B>GE>C D2 E>F | (3GFG A>F G>EC>d | c>AA>^G A>Bc>A | d2 A>F D>FA>d | 
 B>GE>C D2 E>F | (3GFG A>F G>EC>D | E2 D>C D2 :: A>G | F>DA>D F>DA>D | (3GFG B>A (3GFG B>A | 
 F>DA>D F>DA>D | (3CDE A>E (3CDE A>E | F>D (3DDD F>D (3DDD | (3GFG B>A (3GFG B>c | d2 c2 B>GE>C | 
 D>dA>F D2 :|  