Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:Bb
['(d>c) (cB)(BG) (F>G)(Bc) d2 (cB) c2 d>c', 'B2 B2 (B>d)(fg) g2 (f>g) (gf)(fd){d} c2']  
X:1
L:1/8
M:4/4
K:Bb
 (d>c) | (cB)(BG) (F>G)(Bc) | d2 (cB) c2 d>c | (cB)(BG) (FG)(Bc) | d2 (c>B) B2 :| B2 | 
 (B>d)(fg) g2 (f>g) | (gf)(fd){d} c2 (dc) | (c>B)(BG) F>GBc | d2 c>B B2 :|  