Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:3/4
K:F
['z c ce f2']  
X:1
L:1/8
M:3/4
K:F
 C | FA c2 G2 | B<A G2 z c | ce f2 d2 | f<e c2 z c | ce f2 g2 | fd c2 z A | Bd c2 G2 | B<A F2 z c | 
 ce f2 g2 | fd c2 z A | Bd c2 G2 | B<A F2 z |]  