Develop tunes following the predetermined chord changes.
'G', 'D', 'G', 'D7', 'G', 'G', 'D', 'G', 'D7', 'G', 'G', 'D', 'G', 'D7', 'G', 'D', 'G', 'D7', 'G'  
X:1
L:1/4
Q:1/4=115
M:4/4
K:G
"G" G G G"D" A |"G" B d B2 | G/>G/ G/>A/ B B |"D7" A2"G" G z |"G" G G G"D" A |"G" B d B2 | 
 G/>G/ G/>A/ B B |"D7" A2"G" G z ||"G" d2 B"D" A |"G" B d B2 |"D7" A2 A G | A A"G" (B d) | 
 d2 B"D" A |"G" B d B2 | G/>G/ G/>A/ B B |"D7" A2"G" G z |]  