Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:6/8
K:Emin
['GGG GFG', 'GAB F2 A', 'B2 c B2 A', 'B2 A', 'G GFE BBB AGF E3 BAB eee', 'gfe BAB eee fed']  
X:1
L:1/8
M:6/8
K:Emin
|: GGG GFG | AGA BcB | GGG GFG | AFD E3 :: GAB F2 A | AGF GFE | GAB F2 A | AGF E3 :: B2 c B2 A | 
 GBA GFE | B2 c B2 A | GFG E3 :: EFG EFG | AGF GFE | B2 c B2 A |1 GFE B3 :|2 GFG E3 |: BcB B2 A | 
 ABA A2 G | GFE BBB | AGF E3 :: BAB eee | fga gfe | BAB eee | fed e3 :|  