Develop musical pieces based on the specified chord pattern.
'D', 'G', 'A7', 'D', 'A7', 'D', 'G', 'A7', 'D', 'G', 'A7', 'D', 'A', 'A', 'D', 'A', 'D', 'G', 'A7', 'D'  
X:1
L:1/8
M:2/2
K:D
 A2 |:"D" defg a2 f2 |"G" gfge"A7" fdec |"D" defg a2 f2 |"A7" gfed cB A2 |"D" defg a2 f2 | 
"G" gebe"A7" a2 fe |"D" dBAF"G" GBAG |"A7" FDEF"D" D4 ::"A" A4 cABc | ABAG"^(E7)" F2 E2 | 
"A" A4 cABc | ABcA"D" d4 |"A" A4 cABc | ABAG F2 E2 |"D" D2 ED"G" FDGD |"A7" FDEF"D" D4 :|  