Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
['a2 a fef d3 B3', 'A2 A']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
 a2 a fef | d3 B3 | Bcd efg | fed cBA | a2 a fef | d3 B3 | Bgf edc | d2"^NB" d :: F3 GFG | 
 A2 A A2 A | Bcd e2 f | gfe a3 | agf edc | dcB A2 g | fed Bdc | d2"^NB" d :|  