Compose a piece adhering to the given musical structure and theme.
X:1
L:1/8
M:4/4
K:G
['BG (3GGG Bdgd', 'dg g2'  
X:1
L:1/8
M:4/4
K:G
|: BG (3GGG Bdgd | BGBG FGAc | BG (3GGG Bdgd | cBAc BG G2 :| dg g2 dgbg | agbg ea a2 | dg g2 dgba | 
 gedc BG G2 | dg g2 dgbg | agbg ea a2 | bg (3efg dgbg | eaaf gedc ||  