Design a melodically engaging tune in accordance with the suggested chord progression.
'D', 'G', 'Em', 'D', 'G', 'D', 'D', 'A', 'G', 'A', 'D', 'A', 'G', 'D', 'D', 'G', 'Em', 'D', 'G', 'D'  
X:1
L:1/4
Q:1/4=120
M:3/4
K:D
 A |"D" d A F | D3/2 E/ F |"G" G B e/d/ |"Em" c A c |"D" d3/2 A/ F |"G" G3/2 A/ B |"D" A d c | 
 d2 :| d/e/ |"D" f d f |"A" e c A |"G" B3/2 c/ d/e/ |"A" c A d/e/ |"D" f d f |"A" e c A | 
"G" d c B |"D" A2 B/c/ ||"D" d A F/E/ | D3/2 E/ F |"G" G B e/d/ |"Em" c A c |"D" d A F | 
"G" G3/2 A/ B |"D" A d c | d2 |]  