Construct a piece of music using the designated motif as the basis, while ensuring the required form is followed.
X:1
L:1/16
M:2/4
K:G
['B2B2 dcBc', 'd2dc B2B2 g2g2 d4'  
X:1
L:1/16
M:2/4
K:G
 G2G2B2B2 | G2GA B2B2 | dcBc A2A2 | dcBc A2A2 | GDGA B2B2 | GDGA B2B2 | dcBc dcBc | A4 G4 :: 
 d2dc B2B2 | g2g2 d4 | edBc A2A2 | edBc A2A2 | d2dc B2B2 | g2g2 d4 | edBd edBd | A4 G4 :|  