Compose a piece of music that follows the specified structure and incorporates the given theme.
X:1
L:1/8
M:2/4
K:G
['B2 B>A BG DG', 'dB de dB GA/B/'  
X:1
L:1/8
M:2/4
K:G
 B2 B>A | BG DG | A2 A>B | AF ED | B2 B>A | BG DG | FA EF | G2 G2 :: dB de | dB GA/B/ | cB AG | 
 FA D2 | dB de | dB GA/B/ | cA FA G2 G2 :|  