Compose music pieces incorporating the provided chord modifications.
'G', 'Am', 'D7', 'G', 'Am', 'D7', 'G'  
X:1
L:1/8
M:4/4
K:G
|:"G" D2 G2 GFGE | D2 B2 BGAB |"Am" cBcB ABcd |"D7" e2 d2 d^c d2 |"G" D2 G2 GFGE | D2 B2 BGAB | 
"Am" cBcA"D7" DEFG | A2 GF"G" G4 ::  