Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:Amix
['GAg GAf GA e GAe GAeA', 'e2 z', 'geeg ff/f/fg fedB dBde ffed eAA/A/A BAeA', 'eaa eaa']  
X:1
L:1/8
M:4/4
K:Amix
|: GAg GAf GA | e GAe GAeA | GAA/A/A d2 cA | GAA/A/A d2 cA | GAg GAf GA | e GAe GAeA | 
 cAA/A/A dAcA | A/A/A eA e z3 :: GAdA cAGA | A/A/AdA cAA/A/A | cdd/d/d edd/d/d | effe a2 z f | 
 eAA/A/A BAeA | A/A/Ae z d2 cA | GAA/A/A dAcA |1 A/A/AeA e2 z A :|2 A/A/A e2 z Ace |: 
 gg/g/gf geef | gg/g/ga geeg | ff/f/fg fedB | dBde ffed | eAA/A/A BAeA | A/A/Ae z d2 cA | 
 GAA/A/A dAcA | A/A/A e2 z Ace :: gg/g/gf geef | gg/g/ga geeg | ff/f/fg fedB | dBde ffed |1 
 eaa eaa ea | a eaa eaa z | eaa eaa eg | gfed eaef :|2 eAA/A/A BAeA | A/A/Ae z d2 cA | 
 GAA/A/A dAcA | A/A/AeA e z3 ||  