Write musical pieces that adapt to the predetermined chord shifts.
'D', 'G', 'A', 'D', 'Em', 'Em', 'A7', 'D'  
X:1
L:1/8
M:2/4
K:D
"D" AA AA |"G" BB B2S |"A" AB AG/G/ |"D" F2 D2S |"Em" GE EF |"Em" GF EB |"A7" AG FE |"D" DD D2 |]  