Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/8=232
M:4/4
K:Bb
['FE DFBd', 'bBAB gBAB =efga bfdB']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:Bb
|: F2 | B2 FE DFBd | =efgf ^cdAB | c/c/c GF EGcB | Acf=e gfec | B/B/B FE DFBd | =efga bfdB | 
 ge BG Eb ag | fdec B2 :: F2 | bBAB gBAB | =efga bfdB | EGce DFBd | =Bcd=e f^fga | bBAB gBAB | 
 =efga bfdB | geBG Ebag | fdec B2 :|  