Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:2/4
K:A
['gf- fe fa', 'E2 ed- dc/B/ ce- ed ca Ac'  
X:1
L:1/8
M:2/4
K:A
|: Aa- ag- | gf- fe | fa ec | dB AG | A a2 g- | gf- fe | fa B^d | e2 E2 :: ed- dc/B/ | ce- ed | 
 ca Ac | BE E2 | Ac- cB/A/ | Ba gf | ed cB | A2 A,2 :|  