Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/8
M:6/8
K:Bb
['b b2 B B2 f2 f2 F', 'e2 B BGE E2 B']  
X:1
L:1/8
M:6/8
K:Bb
 b | b2 B B2 f2 | f2 F F2 f | f>gf g>ab | a>gf f2 b | b2 B B2 f2 | f2 F F2 f | f>gf g g2 | 
 (f3- f2) :| g | g2 e e2 B | BGE E2 B | e>fg f>ga | g>ag/e/ f3 | gee e2 B | BGE E2 B | e>fe f f2 | 
 e3- e2 g | gee c2 f | fcB A2 f | BBB B2 B | fff f2 f | bbb b2 B | f2 d f2 f | bff d>cB | B3- B2 ||  