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
['=c2 (3AB^c d2 de', 'D2 de f2 fd edcA defd g2']  
X:1
L:1/8
M:4/4
K:D
 FG | A2 AF DEFG | AFed =c2 (3AB^c | d2 de fdAF | G2 GA G2 FG | ABAF DEFG | AGAB =c2 (3AB^c | 
 d2 de fdAG | F2 D2 D2 :: de | f2 fd edcA | defd g2 (3efg | a2 ab agef | dcAB G2 FG | A2 AF DEFG | 
 AFed =c2 (3AB^c | d2 de fdAG | F2 D2 D2 :|  