Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:6/8
K:Dmix
['DED DEG A2 G ABc BAG AGE', 'ded dBG AGA', 'ADD BDD A2 E ABc BAG AGE']  
X:1
L:1/8
M:6/8
K:Dmix
|: DED DEG | A2 G ABc | BAG AGE | GEA GED | DED DEG | A2 G ABc | BAG AGE | GED D3 :| ded dBG | 
 AGA BGE | ded dBG | AGA GBd | g2 e dBG | AEA BGE | B2 G AGE | GAG G3 :| ADD BDD | A2 E ABc | 
 BAG AGE | GEA GED | ADD BDD | A2 E ABc | BAG AGE | GED D3 :|  