Develop a tune that adheres to the given musical structure.
'Binary', 'Sectional: Verse/Chorus'  
X:1
L:1/8
M:2/2
K:G
 g2 dB GBed | cBAG FADF | GFGB edcB | Ad^ce dfaf | g2 dB GBed | cBAG FADF | GBdg ecAF |1 
 G2 B2 G2 (3def :|2 G2 B2 G4 ||[K:D] A{c}BAG FAdf | edcd ef g2 | fedf edce | dfed cB A2 | 
 A{c}BAG FAdf | edcd ef g2 | fedf edce |1 d2 f2 d2 FG :|2 d2 f2 d2 (3def ||  