Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:2/4
K:D
['Ad Bd/B/ AD FA GE', 'Af fe/f/ g>f ed c/B/A']  
X:1
L:1/8
M:2/4
K:D
|: Ad Bd/B/ | AD FA | GE A>B | A>G FD | Ad Bd/B/ | AD FA | GE A/B/A/G/ | FD D2 :: Af fe/f/ | 
 g>f ed | c/B/A ef | e/f/e/d/ cA | Af fe/f/ | g>f ed | c/B/A Bc | d2 dB :|  