Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:6/8
K:Emin
['B B2 B A2 B G2 A', 'B2 e e2']  
X:1
L:1/8
M:6/8
K:Emin
 B | B2 B A2 B | G2 A F2 G | E2 E ^D^C^D |1 E G2- G2 :|2 E E2- E2 || B, | E2 F G2 A | B2 A G2 A | 
 B2 e e2 ^d | e2 ^d B2 e | e2 B A2 B | G2 A F2 G | E2 E ^D^C^D | E E2- E2 |]  