Compose a piece of music using the provided motif and follow the designated alphabet character structure.
X:1
L:1/8
Q:1/2=80
M:2/2
K:Bb
['c=BdB cege .dbfd .cgec', 'F2 GA BAcA Bdfd c=BdB cege .dbfd']  
X:1
L:1/8
Q:1/2=80
M:2/2
K:Bb
 F | BAcA Bdfd | c=BdB cege | .dbfd .cgec | AecA"^1" (F{GF=EF)} GA |"^2"{c} BAcA Bdgd | 
"^2"{d} c=BdB cege | .dbfd .cgec | .AecA B2 ::"^3 ~" (c/4B/4A/4B/4) | cfef cfef | df=ef bfdB | 
 cfef cfef | dfga bfdB | gfed e=Bcg | fedc dA_Bf | efde cdBd | ABGA"^nat 4" F2 GA | BAcA Bdfd | 
 c=BdB cege | .dbfd .cgec | .AecA"^nat 4" F2 GA |"^2"{c} BAcA Bdfd |"^2"{d} c=BdB cege | 
 .dbfd .cgec | .AecA"^Fine" !fermata!B2 :|  