Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
M:2/2
K:D
['FA A/A/A B2', 'f2 df']  
X:1
L:1/8
M:2/2
K:D
 FA A/A/A B2 Ac | dBAF GEEG | FA A/A/A B2 Ag | fdef d/d/d d2 :| | g | f2 df aeeg | f2 df eBBg | 
 f2 df aeeg | faef d/d/d df | f2 df aeeg | f2 df eBBg | f2 df aeef | fdef d/d/d d2 ||  