Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/8
M:3/4
K:Emin
['B g4 a |{b}', 'f4 e2 f B3- B6']  
X:1
L:1/8
M:3/4
K:Emin
 E A2- A3 | Bc B4 | AG E4- | E6 | B e2- e3 | fg f4 | ed B4- | B6 | B g4 a |{b} ag f4 | e2 f B3- | 
 B6 | BA G4 | AB F4 | D2 E4- | E6 || B g4 a |{b} ag f4 | e2 f B3- | B6 | B b4 a | g4- g2 | ga f4- | 
 f6 | gf e4 | fg f4 | e2 f B3- | B6 | BA G4 | AB F4 | E2 E4- | E6 ||  