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
['C2 F3 G AGFE D4 d4 c2']  
X:1
L:1/8
M:2/2
K:F
 C2 |"F" F3 G AGFE |"Bb" D4 d4 |"F" c2 A2"Bb" BAGF |"C7" G6 C2 |"F" F3 G AGFE |"Bb" D4 d4 | 
"F" c2 A2"C7" BAGA |"F" F6 :: c2 |"F" f3 g agfe | f2 c4 A2 | f2 A2"Bb" BAGF |"C7" G6 C2 | 
"F" F3 G AGFE |"Bb" D4 d4 |"F" c2 A2"C7" BAGA |"F" F6 :|  