Write musical pieces that adapt to the predetermined chord shifts.
'D', 'Bm', 'Em', 'A', 'D', 'Bm', 'Em', 'A', 'Em', 'A', 'D', 'B7', 'Em', 'A', 'D', 'D', 'A', 'G', 'D', 'A', 'D'  
X:1
L:1/8
M:2/2
K:D
|:"D" [AD]ddc"Bm" d2 df |"Em" edcd"A" efga |"D" fddc"Bm" d2 df |1,3"Em" edcB"A" AGFE :|2,4 
"Em" edcd"A" efge ::"D" faa^g a3 a |"B7" bagf"Em" ef g2 |"A" Aggf g2 gb | agfe"D" de f2 | 
"D" Addd"A" dccc |"G" cBBB"D" BAAA |"A" Aggf g3 b | agfe"D" d2 d2 :|  