Compose a piece of music that follows the specified structure and incorporates the given theme.
X:1
L:1/8
M:4/4
K:D
['AB d3 e', 'fg a3'  
X:1
L:1/8
M:4/4
K:D
 AB | d3 e defe | d2 B2 B2 AB | d3 e defd | f2 e2 e2 AB | d3 e defe | d2 B2 B2 d2 | ABAG ABde | 
 f2 e2 e2 || fg | a3 b afef | d2 B2 B2 fg | a3 g f2 ed | f2 e2 e2 fg | a3 b afef | d2 B2 g3 B | 
 A2 AB ABde | f2 e2 e2 ||  