Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/16
M:2/4
K:G
['GFGA GDB,C DEDB,2', 'gfga gdBc dedc Bdga', "[gb]2[gb][gb] [gc']2[gc'][gc'] [gc']2[gc'][gc'] [Gc']2[_Be]2 [Be]2ef gage dega"]  
X:1
L:1/16
M:2/4
K:G
 BA |"G" GFGA GDB,C | DEDB,2 G,B,DG | BABc BAGB |"D7" cBAG FDEF |"G" GFGA GDB,C | DEDB,2 G,2B,2DG | 
 Bdef gedc |"D7" BGAF"G" G2 :: dc |"G" BGBc dedc | BGBc dcBd |"C" cBcd eged | cBcd efga | 
"G" bgag efge | dBAG EGDB, | G,B,DG Bdef |"D7" gedB"G" G2 :: ba |"G" gfga gdBc dedc Bdga | 
 bagb agfg |"D7" abag fdef |"G" gfga gdBc | dedc Bdga | bgag efge |"D7" dBAB"G" :: Bd | 
"G" ([d-e][dg])[dg][dg] [dg]2[dg][dg] | [gb]2[gb][gb] [gb]2[gb][gb] | 
"C" [gc']2[gc'][gc'] [gc']2[gc'][gc'] |"C7" [Gc']2[_Be]2 [Be]2ef |"G" gage dega | gedB AGEG | 
 DEGA Bdef |"D7" gedB"G" G2 :|  