Construct a tune that adheres to the designated chord progression.
'G', 'D7', 'G', 'G', 'Em', 'D', 'G', 'G'  
X:1
L:1/16
M:2/4
K:G
|:"G" GBcd edcB |"D7" A2F2 d2F2 |1 FABc dcBA |"G" B2G2 e2G2 :|2 f2e2 dcBA | A2G2"G" G4 :: 
"Em" b2g2 e4 |"D" f2e2 d4 | f2e2 dcBA |1"G" GBcd e2g2 :|2 A2G2"G" G4 :|  