Compose a piece of music that follows the specified structure and incorporates the given theme.
X:1
L:1/8
Q:1/8=128
M:4/4
K:D
['gf gf']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:D
|: de | f2 e>d A<f e>d | B<e d>B A2 fg | a2 b>a af e>d | e4 a3 g | f2 e>d Bg e>d | ed d>B A2 bb | 
 a2 gf gf e>d | d6 AA | e3 f g2 fe | f3 g a2 aa | b>a gf gf ed | e2 f2 g2 fe | d<A A>A Be dB | 
 AB dg b2 d'b | a2 gf gf e>d | d6 :|  