Craft a musical composition by incorporating the provided motif and the alphabetical representation of the given sequence.
X:1
L:1/8
Q:1/4=135
M:3/8
K:Bb
['', 'd c2']  
X:1
L:1/8
Q:1/4=135
M:3/8
K:Bb
 D |: G/ ^F/ G A | B G d | d c2 |1 d2 D :|2 d2 e | d c2 | A/ B/ c d | c B2 | G2 B | A D2 | G2 z ||  