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
['', 'B2 B2', 'fdfb g2 (ga) gfga |1,3', 'edcB ABcA F2 (de) :|2,4 b2 (fd)']  
X:1
L:1/8
M:2/2
K:Bb
 F2 |: B2 (Bc) BFDF | BcdB edcB | Bdfg |1,3 fdBd | edcB AcAF :|2,4 fecd | B2 B2 B2 :: (Bd) |: 
 f2 (fg) fdfb | g2 (ga) gfga |1,3 bagf edcB | ABcA F2 (de) :|2,4 b2 (fd) ecAc | B2 B2 B2 :|  