Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/8
M:2/4
K:D
['AB =c>c'  
X:1
L:1/8
M:2/4
K:D
 B |"D" AD F/G/A |"^(A)" dc AB |"C" =c>c cG |"^(G)" DF GB |"D" AD F/G/A |"^(A)" dc AB | 
"C" =c>c cE |"G" ED D :: e |"D" fg/f/ ed |"A" cA Ad |"D" fd ef |"G" g2 ag |"D" fg/f/ ed | 
"A" cA AB |"C" =c>c cE |"G" FD D :|  