Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
Q:1/8=232
M:4/4
K:F
['cB AF Ac fc Ac Bd gf', 'gf ed cB']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:F
|: cB | AF Ac fc Ac | Bd gf ed cB | Ac fe dc BA | G2 G2 G2 cB | AF Ac fc Ac | Bd gf ed cB | 
 Ac fa gb ge | f2 f2 f2 :: ef | gf ed cB AG | AF GA Bc de | fg af ba gf | e2 c2 c2 cB | 
 AF Ac fc Ac | Bd gf ed cB | Ac fa gb ge | f2 f2 f2 :|  