Compose a musical piece in accordance with the outlined theme and structure.
X:1
L:1/8
M:4/4
K:G
['G2 BG dGgG G2 eG dBAB G2', 'dGBd e3 B d2 Bd eBge dBAB'  
X:1
L:1/8
M:4/4
K:G
|: G2 BG dGgG | G2 eG dBAB | G2 Bd- dega | bage dGBd :: e3 B d2 Bd | eBge dBAB | eB- B2 dega | 
 bage dGBd :|  