Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:A
['F3 A F2 F2']  
X:1
L:1/8
M:4/4
K:A
 c2 c2 Bc c4 | B2 F2 c4 e z c2 Ac A2 F3 A | F2 F2 A2 c3 A | F8 | c2 c2 Bc c4 | 
 BAFcB c3 e z c2 AF c2 F3 A | F2 F2 B2 c3 A | F8 | F2 B2 A2 A F3 | B2 F2 B c3 e z c2 Ac A2 F3 A | 
 F2 F2 A2 c3 A | F8 | c2 c2 Bc c2 BF | ABFcB c3 e z c2 AF c2 F3 A | F2 F2 B2 c3 A | F8 |]  