Design a musical work that abides by the outlined structure and integrates the assigned theme.
X:1
L:1/8
M:4/4
K:G
['G2 AB', 'g2 b/a/g/f/'  
X:1
L:1/8
M:4/4
K:G
 G2 AB cAFD | G2 AB c2 d2 | gdcB ecAc | BGAF G2 G2 :: g2 b/a/g/f/ gdBG | g2 b/a/g/f/ g2 ga | 
 bgaf gedc | BGAF G2 G2 :|  