Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:D
['F/G/ A>BA d2 f edc d2 f/g/', 'g2 f fed B2 d A2 d']  
X:1
L:1/8
M:6/8
K:D
 F/G/ | A>BA d2 f | edc d2 f/g/ | aba agf | fgf e2 F/G/ | A>BA d2 f | edc d2 f/g/ | ad'b afd | 
 gec d2 || c/d/ | e2 a a^ga | fag fed | cea a^ga | fag fed | bgd' d'ag | afd' d'af | bge afd | 
 cde A2 d/ | f2 e g2 f | fed B2 d | A2 d e2 f | gfg e2 d/e/ | f2 d g2 f | fed B2 d | A2 d e2 f | 
 e3 d2 ||  