Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['', 'DFAF BFAF', 'd2 fd']  
X:1
L:1/8
M:4/4
K:D
 F |: DFAF BFAF | DEFD E3 F | DFAF BFAF | (3Bcd ec dBAF | DFAF BFAF | DEFD E3 F | DFAF BFAF | 
 (3Bcd ec d2 z F :: d2 fd Adfd | d2 fd edBA | d2 fd Adfd | g2 fg edBA | d2 fd Adfd | d2 fd e3 f | 
 gefd ecdA | BABc dBAF :|  