Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
Q:1/8=120
M:6/8
K:D
['A ded f2 d', 'd2 f']  
X:1
L:1/8
Q:1/8=120
M:6/8
K:D
 A | ded f2 d | A2 F F2 A | ded f2 d | g2 e e2 A | ded f2 d | A2 F F2 A | d2 f agf | gfg e2 :: A | 
 d2 f agf | gab a2 g | d2 f agf | g2 e e2 A | d2 f a2 f | gab g2 f | b2 g b2 f | gfg e2 :|  