Form a musical piece based on the provided motif while observing the defined structure.
X:1
L:1/8
M:2/4
K:G
['B2 c2 d2 z c BBAA G2']  
X:1
L:1/8
M:2/4
K:G
 B2 c2 | d2 z c | BBAA | G2 z2 | ddcc | BBAA | ddcc | BBAA | B2 c2 | d2 z c | BBAA | G2 z2 |]  