Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:4/4
K:C
['GC C/B,/C', 'GC C/B,/C'  
X:1
L:1/8
M:4/4
K:C
 A>G AB C2 BA | GC C/B,/C GC C/B,/C | A>G AB C2 BA | GC C/B,/C D3 z :| ADAD AD D/C/D | 
 GCGC GC C/B,/C | A>G AB C2 BA | GC C/B,/C D3 z :|  