Generate melodic masterpieces that abide by the suggested chord alterations.
'G', 'Am', 'D7', 'G', 'G', 'D', 'A', 'D', 'G', 'A7', 'D', 'C', 'G', 'Em', 'D7', 'G', 'G'  
X:1
L:1/4
Q:1/2=90
M:2/2
K:G
"G" B G B/c/ d |"Am" e c"D7" A c |"G" B G g G |"G" B2 d2 ::[K:D]"D" f a b/a/g/f/ |"A" e g g f/e/ | 
"D" f a"G" b/a/g/f/ |"A7" e2"D" d2 ::[K:G]"C" e c c/d/e/c/ |"G" d B B/c/d/B/ |"Em" g G"D7" G A |1 
"G" B2 d2 :|2"G" G4 |]  