Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=140
M:4/4
K:F
['F2 FA', 'f2 affc Accf bagf eg g2 afge']  
X:1
L:1/8
Q:1/4=140
M:4/4
K:F
 F2 FA cAcf | F2 FA BGGA | F2 FA cAcf | d>efg af f2 :: affc Accf | bagf eg g2 | afge fdcA | 
 BdcB AF F2 :|  