Develop musical pieces by incorporating the given chord changes.
'D', 'Bm', 'G', 'A7', 'D', 'G', 'A7', 'D', 'A7', 'G', 'A7', 'D', 'Bm', 'Em', 'A7', 'Em', 'A7', 'D', 'Em', 'A7', 'D'  
X:1
L:1/4
M:3/4
K:D
 A |:"D" d2 c |"Bm" B2 A |"G" G3 | G A B |"A7" c2 B | A2 G |"D" F3 | F E F |1"G" B2 A | G2 F | 
"A7" E3 | E F G | e2 d | c3/2 d/ c/B/ |"D" A3 |"A7" A B c :|2"G" B2 A | G2 F |"A7" E2 c | c2 B | 
 A3/2 B/ A | B2 c |"D" d3/2 d/ d | d D E ||"Bm" F3/2 F/ F | F D F |"Em" G3/2 G/ G | G F G | 
"A7" A3/2 B/ A | B2 c |"Em" e d B |"A7" A D E |"D" F3/2 F/ F | F D F |"Em" G3/2 G/ G | G F G | 
"A7" A d G | E D E |"D" D3- | D2 ||  