Construct a musical piece that follows the designated lettered structure and integrates the provided motif throughout.
X:1
L:1/4
Q:1/4=120
M:4/4
K:C
['A3/2 ^G/ A B']  
X:1
L:1/4
Q:1/4=120
M:4/4
K:C
 A3/2 ^G/ A B | c3/2 d/ c B | A3/2 ^G/ A B | c2 G G | e4 | e4 | e2 e2 | d f e d | c2 c2 | B2 d f | 
 e d c B | A2 a7/4 ||  