Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:2/4
K:D
['', 'AF FE DF', 'ec BA Bc']  
X:1
L:1/8
M:2/4
K:D
 d>B |: AF FE | DF FB | AF AF |1 E2 EB | AF FE | DF FA/B/ | A^G/A/ Bc | d2 cB :|2 E2 EF | GE ED | 
 CE E2 | A^G/A/ Bc | d2 dA |: dc/d/ fe | cB/c/ ec | BA Bc | BA FB | dc/d/ fe | cB/c/ ec | BA Bc |1 
 d2 dA :|2 d2 c>B ||  