Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:2/2
K:F
['AcBG AFGE F2', 'c2 (cB) Acfc afcA B2 g2 g2']  
X:1
L:1/8
M:2/2
K:F
 cB | AcBG AFGE | F2 F2 F2 af | efgf edcB | BGAB G2 (cB) | AcBG AFGE | F2 a2 a2 gf | egec dfdB | 
 c2 c2 c2 :: (cB) | Acfc afcA | B2 g2 g2 (BA) | GABG gfcB | A2 f2 f2 (gf) | egec fafd | egec fcAF | 
 BdcB A2 G2 F2 E2 | F2 F2 F2 :|  