Create engaging melodies that harmonize with the provided chord progressions.
'D', 'A', 'G', 'D', 'D', 'A', 'D', 'D', 'G', 'A', 'D', 'D', 'A', 'G', 'D'  
X:1
L:1/4
M:2/2
K:D
 a/f/ |"D" d d d c/d/ |"A" e e e f/e/ |"G" d/c/B/A/ B c |"D" d/c/d/e/ d a/f/ |"D" d d d c/d/ | 
"A" e e e f/e/ | d/c/B/A/ B c |"D" d2 d :: d |"D" f f f e/f/ |"G" g g g a/f/ |"A" e e e d/e/ | 
"D" f f f a/f/ |"D" d d d c/d/ |"A" e e e f/e/ |"G" d/c/B/A/ B c |"D" d2 D :|  