Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:2/2
K:F
['(A/B/c) (cf) (a/g/f/e/)', '(A/B/c) (Fc) dBfd']  
X:1
L:1/8
M:2/2
K:F
 F | (A/B/c) (cf) (a/g/f/e/) fd | cAdA BGGB | (A/B/c) (cf) (a/g/f/e/) f.d | cABG F/F/F F :: c | 
 (A/B/c) (Fc) dBfd | (TcA) (ae) fddf | (A/B/c) (Fc) dBfd | cABG F/F/F F :|  