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
['z d', 'd g z'  
X:1
L:1/8
M:6/8
K:G
 d | B z G c z A | BdB G z d | e z c e z f |{a} gfe d2 f | gfe dcB | edc BAG |1 FGA ABc | 
 BcB A2 :|2 FGA ABA | G3 G2 || d | g z d Bcd | efg d z d | g z f efg | age d z d | g z a bag | 
 efg d2 c | BAG FGA | G3 G2 ||  