Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/16
M:2/4
K:C
['A- A']  
X:1
L:1/16
M:2/4
K:C
 z2 d3/2 d/ d g f a | g f e d d ^c e d- | d A/ A/ A B d c e d- | d c/ c/ B/ A/ c g2 f d- | 
 d c B A c G3- | G8 | z G ^F G A c B/ c/ A- | A f/ f/ e d d3/2 B/ c A- | A D E F G3/2 c/ B/ c/ A- | 
 A F E3/2 C/ D4 | D G ^F G A c B/ c/ A- | A f e d d3/2 B/ c A- | A D E F G3/2 c/ B/ c/ A | 
 G F E C D4 | D G ^F G A c B/ c/ A- | A f e3/2 d/ d3/2 B/ c A- | A D E F G c B/ c/ A | 
 G F E3/2 C/ D4 |]  