Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/8
Q:1/4=60
M:2/4
K:Bb
['B z', 'A D2 D']  
X:1
L:1/8
Q:1/4=60
M:2/4
K:Bb
"F" FF/F/ A/F/A/c/ |"Bb" B z B z | z2 |:[Q:1/4=60]"Bb" (3(_bag) fd | BB/B/ d/B/d/f/ | 
"F" FF/F/ A/F/A/c/ |"Bb" BB/B/ d/B/d/f/ |"Bb" (3(_bag) fd | BB/B/ d/B/d/f/ |"F" FF/F/ A/F/A/c/ | 
"Bb" B z"D" A z |[Q:1/4=65]"Gm" GB GB |[Q:1/4=70]"D" A D2 D |[Q:1/4=80]"Gm" GB GB | 
[Q:1/4=90]"D" d z d2 |[Q:1/4=100]"Gm" GB GB |"D" A D2 D |[Q:1/4=110] dc BA |"Gm" G z G z | 
[Q:1/4=120]"Gm" (G/A/B) (G/A/B) |"D" A D2 D |"Gm" (G/A/B/A/) (G/A/B/c/) |"D" d z d z | 
"Gm" (G/A/B) (G/A/B) |"D" A D2 D | d (3(c/d/c/) BA |"Gm" G z [Gg] z | z4[Q:1/4=60] :|  