Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:6/8
K:G
['gdB gdB', '=f_BB gBB'  
X:1
L:1/8
M:6/8
K:G
|: gdB gdB | gdB g2 a | bag gfg | afd d2 e | gdB gdB | gdB g2 a | bag fga | ggg g3 :: =fd_B BA B | 
 =f_BB gBB | =fd_B BAB | cA=F FAc | =fd_B BAB | =f_BB gBB | =fgf fga | _bbb b3 :|  