Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/8
M:2/4
K:G
['G2 z']  
X:1
L:1/8
M:2/4
K:G
 D | GABc | dddB | cB/c/dB | G2 z D | GABc | dddB | cB/c/dB | G2 z B | cccA | BBBG | AB/c/dB | 
 G2 z B | cccA | BBBG | AB/c/dB | G2 z |]  