Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/4
K:D
['dAFD fa a2 gecA eg g2 dAFD', 'af/g/ af/g/']  
X:1
L:1/8
M:2/4
K:D
 dAFD | fa a2 | gecA | eg g2 | dAFD | faag | fe/d/ e/g/e/c/ | d2 D2 :: af/g/ af/g/ | af/g/ a2 | 
 ge/f/ ge/f/ | ge/f/ g2 | dAFD | faag | fe/d/ e/g/e/c/ | d2 D2 :|  