Compose a music piece that includes the specified motif while adhering to the outlined alphabetical sequence.
X:1
L:1/8
Q:1/4=140
M:4/4
K:Amin
['.A,2 A,B, CA,CD EDEF', 'g2 B2 Bdga bgag edcd eg a2', 'ABAF GFGA BGAG EDCD EA A2 A4']  
X:1
L:1/8
Q:1/4=140
M:4/4
K:Amin
|:"^A" .A,2 A,B, CA,CD | EDEF AB .c2 | .A,2 A,B,CA, CE | GBAG EDCE | .A,2 A,B, CA,CD | EDEF ABcd | 
 egab a2 ea | ^f ged cA A2 ::"^B" eg a2 a2 ab | aged g2 B2 | Bdga bgag | edcd eg a2 | a4 Aceg | 
 a2 abag ed | g2 B2 Bdga | bgag edcd | eg a2 a4 :|"^C once""^4" [AA]2 [Ac][AA] [AB]AAA | 
 cABc ABAF | GFGA BGAG | EDCD EA A2 | A4 z4 |]  