Develop harmonious melodies based on the provided chord structures.
'D', 'A7', 'D', 'A7', 'D', 'D', 'D', 'A7', 'D', 'A7', 'D', 'D'  
X:1
L:1/4
M:3/4
K:D
"D" A/>d/ f f | A/>d/ f f | f g f |"A7" e2 a/4a/4a/ | a e a/4a/4a/ | a e a/4a/4a/ | a e g | 
"D" f2 z | A/>d/ f f | A/>d/ f f | a b a |"A7" e2 a/>a/ | a e a/>a/ | a e c'/>b/ | a a/g/ f/e/ |1 
"D" d d z :|2"D" d d f/g/ |:"D" a b a |"A7" g/e/ c' e/g/ | b c' b |"D" a/f/ d'/f/ a | a b a | 
"A7" g/e/ c' e/g/ | c'/>b/ a/>g/ f/>e/ |1"D" d d f/g/ :|2"D" d d z |]  