Develop a musical composition that includes the supplied motif while following the designated alphabetical pattern.
X:1
L:1/4
M:3/4
K:Bb
['c B']  
X:1
L:1/4
M:3/4
K:Bb
 B c B | B/A/ A z | c B A | A/>B/ B z | f e d | d c B | c e/>c/d/>B/ | d c z | f e d | d/e/ e z | 
 e d c | c/d/ d z | G G f | f e d/B/ | G/>c/ B A | A/B/ B z |]  