Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:3/8
K:F
['C FFG AcB']  
X:1
L:1/8
M:3/8
K:F
 C | FFG | AcB | A>AG | F2 C | FFG | AcB | AAG | F2 G | AAB | cAc | fcB | A2 G | FDE | FFG | (Afc | 
 d)AG | F2 |]  