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:Emin
['AGF E2 F G2 B', 'e2 f']  
X:1
L:1/8
M:6/8
K:Emin
|: AGF | E2 F G2 B | e3 eBc | d2 d dAc | B2 B AGF | E2 F G2 B | eBe gfe | d2 B A2 G | A3- :: Ac^d | 
 e3 e2 f | g3 gdB | a2 a a2 b | e2 d Ac^d | efe edB | e2 f gfe | d2 B A2 G | A3- :|  