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
['de f2', 'A defg']  
X:1
L:1/8
M:4/4
K:D
 de | f2 A>B A3 d | BABd e2 de | f2 A2 gfed | B3 c d2 de | f2 A>B A3 d | BABd e2 de | f2 A2 gfed | 
 B3 c d2 :: A | defg a3 a | bagf e3 A | defg abag | f3 g a2 A2 | defg a2 fa | bagf e2 de | 
 f2 A2 gfed | B3 c d2 :|  