Compose a music piece that includes the specified motif while adhering to the outlined alphabetical sequence.
X:1
L:1/4
Q:3/4=90
M:6/4
K:Bb
['d g3/2 a/', 'g f']  
X:1
L:1/4
Q:3/4=90
M:6/4
K:Bb
 d | g3/2 a/ g f/g/ a d | g3/2 a/ b c' a b | f2 a a2 d | c3/2 d/ e (f d) e | c A B ^F3/2 G/ A | 
 A2 G G2 :: B/c/ | d3/2 c/ d c3/2 B/ A | e3/2 d/ e c f e | d2 B B2 f | d g f =e f g | f g a g a b | 
 a2 g g2 :|  