Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:6/8
K:Bmin
['B2 B', 'fdB B2', 'def gfe']  
X:1
L:1/8
M:6/8
K:Bmin
|: B2 B BAF | FEF DFA | B2 B B^AB | d2 e fed | B2 B BAF | FEF DFA || def gfe |1 fdB B2 z :|2 
 fdB B2 A |: def a3 | afb afe | d2 A def | gfe fdB | def a3 | afb afe | def gfe |1 fdB B2 A :|2 
 fdB dBA ||  