Construct a musical composition using the provided motif and maintain the designated form.
X:1
L:1/4
Q:1/2=100
M:2/2
K:Bb
['A G']  
X:1
L:1/4
Q:1/2=100
M:2/2
K:Bb
 G d2 A | B2 A G | F B A G | ^F D D2 | G d2 A | B2 A G | B2 c2 | d2- d2 ::  