Develop harmonious melodies based on the provided chord structures.
'D', 'D', 'A7', 'D', 'D', 'G', 'D', 'A7', 'D', 'D'  
X:1
L:1/8
M:3/4
K:D
"D" Adf |:"D" aa ag fe | dd df ed |"A7" ee eg fe |1"D" dd dA df :|2"D" d2- d z :| 
"^Smooth (waltz)" A2 |:"G" B2 d2 cB |"D" A2 f2 ed |"A7" c2 g2 fe |1"D" d2 f2 A2 :|2"D" d2- d z :|  