Generate melodic masterpieces that abide by the suggested chord alterations.
'G7', 'C', 'G7', 'C', 'C', 'F', 'D', 'G'  
X:1
L:1/8
M:4/4
K:C
|:"G7" f2 f2 e2 d2 | f2 ff e2 d2 |"C" c3 A G3 A | c2 c2 A2 G2 |"G7" f2 f2 e2 d2 | f f2 f e2 d2 | 
 GABc defg |"C" e2 c2 c4 ::[K:C]"C" CEGC EGCE | GCEG CEGE |"F" C_EGC EGCE | GC_EG CEGE | 
"D" D^FAD FADF | ADFA DFAF |"G" _B=BgB ^GAgA | ^FG e2 _e2 e2 |1 ^c2 ^A2 ^f2 ^d2 | ^c2 ^A2 ^F4 :|  