Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
['Bdd gdd eBB aAA Bdd g2 f', '(B/c/d)B c2 A'  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 Bdd gdd | eBB aAA | Bdd g2 f | edc BGG :: (B/c/d)B c2 A | (B/c/)dB eAA | (B/c/d)B c2 A | 
 Bdg BGG :|  