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:D
['=c2 A BdB =cBc AGE', 'DEE AG/E/G AGE'  
X:1
L:1/8
Q:1/8=160
M:6/8
K:D
 B | =c2 A BdB | =cBc AGE | =cBd cBA | GEE GAB | =c2 A BdB | =cBc AGE | d=cA GEA | DED D2 :| E | 
 DEE AG/E/G | AGE EDE | DEE AG/E/G | AGE D2 E | DEE AG/E/G | AGE EDE | =cBA GEA | DED D2 :|  