Develop a musical composition incorporating the given motif while adhering to the outlined alphabetical form.
X:1
L:1/8
M:2/4
K:Bb
['B,<B, B,<B, (C<B,) (B,A,/)G,/ A,A, G,D, |]:', 'G,G, D,']  
X:1
L:1/8
M:2/4
K:Bb
 B,<B, B,<B, | (C<B,) (B,A,/)G,/ | A,A, G,D, |]: A,<A, A,A, | A,>G, G,G,/E,/ | G,G, D, z | 
 A,A,/G,/ G,G,/F,/ | G,G, D, z | A,A,/G,/ G,G,/F,/ | G,G, D, z :|  