Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=100
M:6/8
K:F
['CCC CCC CFG A3 GGG GGF F2', 'A F3- F2']  
X:1
L:1/8
Q:1/4=100
M:6/8
K:F
"F" CCC CCC | CFG A3 |"C7" GGG GGF | AAG"F" F2 z | CCC CCC | CFG A3 |"C7" GGG GGF | AAG"F" F2 z || 
"F" ccc c2 A |"Bb" GFD D3 |"C7" CCC G3 |"F" CFG A2 z | ccc c2 A |"Bb" GFD D3 |"C7" CCC G2 A | 
"F" F3- F2 z |]  