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
['(Bd)c BAG AEF G2 A (B>e)e dBA', '(ga)g fed'  
X:1
L:1/8
M:6/8
K:G
 c | (Bd)c BAG | AEF G2 A | (B>e)e dBA | (GB)d gdc | (Bd)c BAG | AEF G2 A | (B>e)e dBA | BGG G2 :: 
 f | (ga)g fed | (B>d)d def | (ga)g fed | (B>e)e e2 f | (ga)g fed | (Bd)d def | gfg fag |1 
 fef gdc :|2 fef g2 ||  