Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:4/4
K:Emin
['[cg]cc[cg] cc[cg]c', 'EGAG EGAG', 'ABcd eAAd AAcA ABAA ABcd eGGd GGcG', 'ABcd eFFd FFcF FBFF ABcd edcB cBAG']  
X:1
L:1/8
M:4/4
K:Emin
"Em" e2 dc BAGF | GAFG E2 B2 | e2 ef gfef | gafg e4 |"Am" a2 gf edcB | cdBc A2 E2 | A2 AB cBAB | 
 cdBc A4 ||"B" BB[Bf]B B[Bf]BB |"C" [cg]cc[cg] cc[cg]c |"B" BB[Bf]B B[Bf]BB"C" [cg]cc[cg] cc[cg]c | 
"B" [Bf]BBB"C" [cg]ccc |"B" [Bf]BBB"C" [cg]ccc |"B" [Bf]B^cc ^ddee | ffgg aabb |:"Em" egbe bgeg | 
"B/D#" ^dfbf bfdf |"D" =dfab afdB |"A/C#" ^ceae aecA |"C" =cege cege |"Em/B" Bege Bege | 
"Edim/Bb" _Bege Bege |"B" =Bege fe^de :|[K:Amin]"Am" EGAG EGAG | EGAB cABG | EGAG EGAG | 
 EFED"Em" CDB,C |"Am" EGAG EGAG | EGAB c2 cd |"Em" edcB cBAG |1"D" EAAG A3 G :|2"D" EAAG ABcd | 
"Am" eAAd AAcA | ABAA ABcd |"G" eGGd GGcG | GBGG ABcd |"Dm7/F" eFFd FFcF | FBFF ABcd | 
"Em" edcB cBAG | EAAG ABcd |"Dm7/F" eAAd AAcA | ABAA ABcd |"Em" eGGd GGcG | GBGG ABcd | 
"Dm" eFFd FFcF | FBFF ABcd |"Em" edcB cBAG | EFED"G" CDB,C ||  