Assemble a musical creation that incorporates the furnished motif and conforms to the predetermined alphabetical structure.
X:1
L:1/8
M:2/2
K:Bb
['d2 d2']  
X:1
L:1/8
M:2/2
K:Bb
 z4 z2 z B | B3/2 A/ GA B3 (c/B/) | A/A/ FF F F3 F | G2 GA B2 AG | d2 d2 d2 cc | BB BB d2 cB | 
 cc cc c3 (B/c/) | d2 cB(AG) Ac | B2 G2 G3 z |]  