Compose a musical piece using the specified sequence's alphabetical representation and the provided motif.
X:1
L:1/8
M:4/4
K:G
['', 'Bcde dcBc', 'BcBA G2 BG']  
X:1
L:1/8
M:4/4
K:G
 dc |: Bcde dcBc | dBgB bBgB | Bcde dcBc | Aaag fedc | Bcde dcBc | dBgB bBgB | bagf gfed | 
 egfa gedc :: BcBA G2 BG | DGBG DG B2 | BcBA G2 BG | FGAB cedc | BcBA G2 BG | DGBG DGBc | 
 dBcA BGAF | DEFG ABcA :|  