Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
Q:1/8=160
M:6/8
K:G
['BAG EGD', 'GBd efg'  
X:1
L:1/8
Q:1/8=160
M:6/8
K:G
 A | BAG EGD | EGG GEG | BAG EGD | EAA ABc | BAG EGD | EGG GEG | BAG EGD | EGG G2 :| z | GBd efg | 
 edB BAG | GBd efg | def g3 | GBd efg | edB BAG | BAG EGD | EGG G2 :|  