Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:Emin
['B3 G']  
X:1
L:1/8
M:4/4
K:Emin
|: E2 Bc B3 G | A z AG FG{A}GF | EBBc B3 G | AA GA F2 FF :|  