Compose a piece adhering to the given musical structure and theme.
X:1
L:1/8
M:4/4
K:C
['[M:6/8][K:G] .abc DBB B2 d cAA A2', 'Bcd def gfe fdB'  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:G] .abc DBB B2 d | cAA A2 c | BGG GFG | ABG FED | DBB Bcd | cAA ABc | dGG DGG | BGG G3 :: 
 Bcd def | gfe fdB | ded dBG | GAG FED | Bcd def | gfe fdB | dGG DGG | BGG G3 :|  