Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:6/8
K:G
['G2 B d2 B e2 c', 'G3 AGA FGA BAB GAB cBc ABc'  
X:1
L:1/8
M:6/8
K:G
 G2 B d2 B | e2 c A3 | BdB GBG | FAF D3 | G2 B d2 B | e2 c ABc | dBG EAF | G3 G3 :: AGA FGA | 
 BAB GAB | cBc ABc | dcd Bcd | ede cde | def gdB | c2 A dcA | G3 G2 z :|  