Construct a musical piece using the designated motif and sticking to the alphabetical form presented.
X:1
L:1/8
M:4/4
K:Amin
['cA ec', 'Aaag a2 ea', 'c2 [ec]c', 'AB (3cBA']  
X:1
L:1/8
M:4/4
K:Amin
 AB | cA ec cA ec | BcdB G2 AB | (3cBA eA cA eA | BAGB A2 :| AB | Aaag a2 ea gedB GBdc | 
 Aaag a2 ea | gedB A2 :| AB | c2 [ec]c c2 [ec]c | d2 [fd]d d2 [fd]d | eaag agea | gecB A2 :| 
"^Variation to A part" AB | (3cBA gA ^fAgA | edBA G2 AB | (3cBA aA gAaA | ecdB A2 :|  