Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/16
M:2/4
K:G
['[G,D]2 [G,G]2[G,G]2 GABc [Dd]2([Dd-]2d)gfe dedc', 'G2G2G2 (g2 g)fed cBAG [Ec]2[Ec]2[Ec]2a2- agfe dcBA'  
X:1
L:1/16
M:2/4
K:G
 [G,D]2 | [G,G]2[G,G]2 GABc | [Dd]2([Dd-]2d)gfe | dedc BcBA | G2G2G2 :: (g2 | g)fed cBAG | 
 [Ec]2[Ec]2[Ec]2a2- | agfe dcBA | [GB]2[GB]2[GB]2g2- | gfed cBAG | [Ec]2[Ec]2[ce]2g2 | e2dc BcAB | 
 G2G2G2 :|  