Write a musical work incorporating the specified theme and letter-based framework.
X:1
L:1/8
M:4/4
K:D
['fed cAG', 'fef gfg']  
X:1
L:1/8
M:4/4
K:D
 A/G/ | FEF GE=C | Ddc Ade | fed cAG | FAF GE=C | FEF GFG | Adc d2 e | fed cAG | Adc d2 :| A | 
 def gfg | aba ged | fef gfg | agf g2 e | fef gfg | afd cAG | FEF GFG | Adc d2 :|  