Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:Bmin
['f2 fe fece f2', 'eAce fBBA', 'f2 af']  
X:1
L:1/8
M:4/4
K:Bmin
|: f2 fe fece | f2 fd eAce | f2 fe fece | f2 af eAce :: fBBA B2 de | fB B2 eAce | fBBA Bcde |1 
 f2 af eAce :|2 f2 af edcA |: B2 bB aBgB | B2 fB edcA | B2 bB aBgB |1 f2 af edcA :|2 f2 af eAce ||  