Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:6/8
K:G
['A B2', 'e3 fge']  
X:1
L:1/8
M:6/8
K:G
 EGE G2 A | B2 e dBG | A2 B c2 A | B2 G FED | EGE G2 A | B2 e dBG | A2 B c2 A | BGE E3 :: e3 fge | 
 fab fed | e3 fge | fed e3 | e2 f g2 e | fab fed | e2 B c2 A | B G E E3 :|  