Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:Bmin
['B2 AB dGGF', 'ga fA A2 d2 cd ecAF g2']  
X:1
L:1/8
M:4/4
K:Bmin
|: B,2 F2 B2 AB | dGGF G2 FG | ADDD DEF/E/D | EAFD E2 DC | B,2 F2 B2 AB | dGGF G2 FG | 
 ADDD DEF/E/D |1 EAFD E2 DC :|2 E2 z2 G4 |: fBBA B2 AB | dGGF G2 ga | fA A2 d2 cd | ecAF g2 g2 | 
 fBBA B2 AB | dGGF G2 FG | ADDD DEF/E/D |1 EFGA Bdeg :|2 E2 z2 z4 ||  