Assemble a piece of music following the alphabetical representation and incorporating the provided motif.
X:1
L:1/8
M:2/2
K:D
['A3 G']  
X:1
L:1/8
M:2/2
K:D
|: A3 G FGAB | =c2 dc BG G2 | A3 G FAdg | fdec Ad d2 :|  