Design a melodically engaging tune in accordance with the suggested chord progression.
'D', 'Em', 'A7', 'A', 'D', 'Em', 'A7', 'D', 'D', 'A', 'D', 'A', 'D'  
X:1
L:1/8
M:6/8
K:D
|: A |"D" d2 e f2 e | dcd"Em" B2 B |"A7" g2 A cBA |"A" e2 A cBA |"D" d2 e f2 e | dcd"Em" B2 B | 
"A7" g2 A cBA |"D" d3 d2 :: A |"D" d2 e f2 a | baf a2 f |"A" e2 A cBA | e2 A cBA |"D" d2 e f2 a | 
 baf a2 f |"A" e2 A cBA |"D" d3 d2 :|  