Craft a musical work based on the specified structure and given theme.
X:1
L:1/8
Q:1/4=120
M:4/4
K:G
['G/A/B/c/ dB gBdB', 'g>age a>baf'  
X:1
L:1/8
Q:1/4=120
M:4/4
K:G
 B | G/A/B/c/ dB gBdB | gBdB aAAB | G/A/B/c/ dB gBdB | cAdc BGG :: f | g>age a>baf | g>age beef | 
 g>age a>baf | gddc BGG :|  