Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
M:4/4
K:F
['cB A2 F2 FAGF EG B2 BdcB', 'F2 (3cde fcAc fagf geAe gbag afgb']  
X:1
L:1/8
M:4/4
K:F
|: cB | A2 F2 FAGF | EG B2 BdcB | Acde fcdB | A2 F2 F2 :: (3cde | fcAc fagf | geAe gbag | 
 afgb fdgf | e2 c2 c2 ec | (3def (3ABc B2 ba | gfed c2 BA | (3Bcd (3EFG FdcB | A2 F2 F2 :|  