Construct music pieces following the indicated chord shifts.
'D', 'A7', 'D', 'A7', 'D', 'G', 'A7', 'D'  
X:1
L:1/4
M:3/4
K:D
 a |"D" a2 a | f g a | g f2- | f2 e | d e f | d c B |"A7" A3- | A2 f/f/ |"D" f2 f |"A7" A B c | 
"D" d2 e | f2 f |"G" e f g |"A7" c d e |"D" d3- | d2 |]  