Create a musical composition incorporating the given motif following the designated alphabetical pattern.
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
['B>f d>f']  
X:1
L:1/8
Q:1/8=128
M:4/4
K:Bb
|: B<G F>E D>C B,>d | e<c f>d c/c/c c2 | c/B/_A/G/ A/G/F/E/ D>C B,>d | e<c f>d B/B/B B2 | 
 B<G F>E D>C B,>d | e<c f>d c/c/c c2 | c/B/_A/G/ A/G/F/E/ D>C B,>d | e<c f>d B/B/B B2 | 
 B>f d>f B>f d>f | e>g d>f c/c/c c2 | B>f d>f B>f d>f | e<g f>d B/B/B B2 | B>f d>f B>f d>f | 
 e>g d>f c/c/c cg/a/ | b>g a>f g>e f>d | e<c f>d B/B/B B2 :|  