Design a melodically engaging tune in accordance with the suggested chord progression.
'D', 'A', 'A7', 'D', 'D7', 'G', 'Em', 'A', 'A7', 'D', 'D', 'A', 'A7', 'D', 'D7', 'G', 'Em', 'A', 'A7', 'D'  
X:1
L:1/8
M:2/4
K:D
"^A" A |"D" dd BA | F F2 A | dd BA |"A" c3 A | cc BA | c c2 B |"A7" A>A BA | F3 A |"D" dd BA | 
 F F2 E |"D7" D>D EF |"G" G3 d |"Em" e e2 d |"A" c c2 B |"A7" A>A Bc |"D" d3 ||"^B" e | 
"D" fa/f/ ed | f f3 | fa/f/ ed |"A" c3 e | a a2 e |"A7" g g2 e | c>ccB | A3 d |"D" fa/f/ ed | 
 f f2 e |"D7" d>d c=c |"G" B3 d |"Em" e e2 d |"A" c c2 B |"A7" A>A Bc |"D" d3 ||  