Develop a musical composition that includes the supplied motif while following the designated alphabetical pattern.
X:1
L:1/8
Q:1/4=100
M:2/2
K:Bb
['(d/e/f/e/) dc Bg-gf/e/ d2 c2{c} B3 c', 'f4 bf-fe/d/ gf-fg/a/ bf-fe/d/ g2 f2 bf-fe/d/']  
X:1
L:1/8
Q:1/4=100
M:2/2
K:Bb
 (d/e/f/e/) dc Bg-gf/e/ | d2 c2{c} B3 c | (d/e/f/d/) bg =ef-fb | a2{a} g2 f4 :: bf-fe/d/ gf-fg/a/ | 
 bf-fe/d/ g2 f2 | bf-fe/d/ g/a/b/g/ fe | d2 c2 B4 :|  