Craft a musical composition that incorporates the supplied alphabet sequence and motif.
X:1
L:1/4
M:4/4
K:Bb
['B A']  
X:1
L:1/4
M:4/4
K:Bb
 F | B B c c | d3/2 c/ B F | G e/c/ B A | B2 z d | c3/2 B/ A B | c3/2 d/ c B | A A G/^F/G/A/ | 
 F2 z F | c c d d | e3/2 d/ c c | d d e e | f3/2 e/ d F | d c B A | G3/2 B/ F B | c e/c/ B A | 
 B2 z |]  