Develop a melody while staying within the specified chord structure.
'D', 'G', 'A', 'D', 'D', 'A7', 'D', 'G', 'A', 'Bm', 'Em', 'A7', 'D', 'D', 'D', 'D', 'G', 'A7', 'D', 'G', 'D', 'G', 'A7', 'D'  
X:1
L:1/8
Q:1/8=120
M:6/8
K:D
"D" d2 d dcd |"G" B2 G"A" FGA |"D" d2 d d3 |"D" fda"A7" f2 d |"D" d2 d dcd |"G" B2 G"A" FGA | 
"Bm" d2 d"Em" d2 g |"A7" e2 a"D" f2 d ::"D" aba f2 d |"D" AFd AFd |"D" aba f2 d |"G" BGd BGd | 
"A7" aba"D" f2 d |"G" B2 G"D" F2 A |"G" B2 d"A7" e2 c |"D" d6 :|  