Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:Amin
['', 'eag edc', 'edc A3 GAc dec deg aeg dec']  
X:1
L:1/8
M:6/8
K:Amin
 B |: cde AGE | GAB A3 | eag edc | d e2 AGE | c2 e dcA | G3 Gcd | eag edc |1 dBG A2 B :|2 
 dBG Aeg |: a3 ged | edg edc | A3 GAc | dec deg | aeg dec | A3 GEG | cde ged |1 cAG Aeg :|2 
 cAG A2 B ||  