Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:6/8
K:D
['dcd efg', 'FAB cBc']  
X:1
L:1/8
M:6/8
K:D
 uA | dec dcd | efg f2 d | ecA GFG | ABc A2 G | Adc dcd | efg fed | ecA GFE | DFA d2 :: 
[K:Dmix] uE | FAB cAA | BGG cAG | FAB cBc | Adc d2 D | FAB cBc | Ade fed | ecA GFE | FDD D2 :|  