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:D
['f2 f2 fedc d2 d2 dAFD', 'AF DFAF DFAF']  
X:1
L:1/8
M:4/4
K:D
 de | f2 f2 fedc | d2 d2 dAFD | EDEF GFGA | BABc dcBA | f2 f2 fedc | d2 d2 dAFD | defg afaf | 
 bgec d2 :: AF | DFAF DFAF | BAGF E2 EF | GEGE GEGE | AGFE D2 AF | DFAF DFAF | BABc d2 AG | 
 F2 D2 E2 DE | F2 D2 D2 :|  