Assemble a musical creation that incorporates the furnished motif and conforms to the predetermined alphabetical structure.
X:1
L:1/4
M:3/4
K:Bb
['a a', '(b3 b) z', '(E3 E) z']  
X:1
L:1/4
M:3/4
K:Bb
"Bb" (d3 | d) f b | d'2 c'/b/ | f3 |"F7" a2 g | e a3/2 g/ |"Bb" g2 f | d3 | (d3 | d) f b | 
 d'2 c'/b/ | f3 |"Cm" g/e/ g3/2 c'/ |"F7" Ta g a |1"Bb" (b3 | b) z z :|2"Bb" (b3 | b) f/d/ f/b/ |: 
"F7" a a a |"Eb" g g g |"Bb" f/f/ f f | z g f |"F7" c/c/ c c | z g f |"Bb" d/d/ d d | z f/d/ f/b/ | 
"F7" a a a |"Eb" g g g |"Bb" f/f/ f f | z b d' |"Cm" c'2 g |"F7" a g a |1"Bb" (b3 | b) z z :|2 
"Bb" (b3 | b) z B, ||[K:Eb]"Eb" B3 | G3 | (e3 | e) d c | B3 | E2 F | (G3 | G) z G |"Bb7" F2 =E | 
 F2 G | A2 B | d2 c |"Eb" c3 | B =A _A | (G3 | G) z E | B3 | G3 | e3 | e d e | f2 e | B2 A | 
"Fm" (G3 | F) z F |"Bb7" d2 c |"Eb" B2 E |"Bb7" D2 A |"Eb" G2 F |"Ab" C2 E |"Bb7" D2 F |"Eb" (E3 | 
 E) z B |:"Bb7" B2 A | F2 c |"Eb" c2 B | G2 e |"Bb7" e2 d | F G A |"Eb" c2 B | G2 B |"Bb7" B2 A | 
 F2 d |"Eb" f2 e | B2 G |"Fm" d2 c |"Bb7" B F3/2 G/ |1"Eb" (E3 | E) z B :|2"Eb" (E3 | E) z z |]  