Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:A
['ed cBAc BAGB Aaga fecA', 'eaga eaga']  
X:1
L:1/8
M:4/4
K:A
|: ed | cBAc BAGB | Aaga fecA | GBEB Bcdf | edcd B2 ed | cBAc BAGB | Aaga fecA | GABc defg | 
 a2 A2 A2 :: cd | eaga eaga | eaga fecA | GABc dcde | fedc B2 cd | eaga eaga | eaga fecA | 
 GABc defg | a2 A2 A2 :|  