Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:C
['B2 A GFE', 'B>cB g2 g']  
X:1
L:1/8
M:4/4
K:C
 C |9[K:G] MB>cB B2 A GFE | G>AG B2 g f2 e | B>cB B2 A GFE | G2 A Be^d e2 :| B>cB g2 g fed | 
 B>cB g2 g f2 e | B>cB g2 g fga | g>fe Be^d e3 | B>cB g2 g fed | B>cB gag fga | bag gfe fga | 
 gab Be^d e3 |]  