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
['A/G/ FDD D2 F GEE E2 c', 'D2 d/e/ fef def ede cde dcd'  
X:1
L:1/8
Q:1/8=160
M:6/8
K:D
 A/G/ | FDD D2 F | GEE E2 c | dcB AGA | FDD D2 :| d/e/ | fef def | ede cde | dcd fed | cAA A2 A | 
 BGB egG | AFA dfF | GFG BAG | FDD D3 |]  