Develop tunes following the predetermined chord changes.
'A', 'G', 'A', 'G', 'A', 'G', 'A', 'G', 'A', 'G', 'A', 'G'  
X:1
L:1/8
M:2/2
K:D
"A" a2 fa eA A2 | cA eA cA A2 | a2 fa eA A2 |"G" Bcdc BG G2 |"A" a2 fa eA A2 | cdef"G" g2 fg | 
"A" af ge fd ec |"G" Bcdc BG G2 :|"A"{A} cA eA fA eA |{A} cA af eA A2 | cA eA fA eA | 
"G" Bcdc BG G2 |"A"{A} cA eA fA eA | cdef"G" g2 fg |"A" af ge fd ec |"G" Bcdc BG G2 :|  