Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:4/4
K:A
['a2 ab aecA', 'Acec dAcA'  
X:1
L:1/8
M:4/4
K:A
|: (3efg | a2 ab aecA | defd edcA | a2 ab aecA | defg a2 ef | =gaba gfge | defd efed | c2 AB cABA | 
 GABG A2 :: (3EFG | Acec dAcA | BAGA BcdB | Acec dAcA | BGGE A2 (3EFG | Acec dAcA | BAGA BcdB | 
 e3 e2 fec | BGGE A2 :|  