Craft a musical work adhering to the specified theme and structure.
X:1
L:1/8
Q:1/4=130
M:2/2
K:G
['B2 GB', 'g2 dB'  
X:1
L:1/8
Q:1/4=130
M:2/2
K:G
 d | B2 GB dedc | B2 GB cAAd | B2 GB dedc | BdAc BGG :: f | g2 dB g2 dB | ggdB cAAf | g2 dB g2 dB | 
 cAcc BGG ||  