Create melodies that conform to the specified chord modifications.
'G', 'G7', 'C', 'G', 'D7', 'G'  
X:1
L:1/8
M:4/4
K:G
 B2 ||"G" c2 d2 vB uG3 | BBc^c dd_B=B | G6 [gBDG,]2 |"G7" [=fADG,] f3- fu^dveud | 
"C" ve uc3 vG uE3 | veu=fveud- d uc2 u[B-G] |"G" B4- BdudvBuG | D4- Dudvdud |"D7" d2 d2 vc ud3 | 
 DEG_B =Bd_B=B |"G" G2 _B2 (3(v=BA)uG vEuD | vG6 |]  