Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
M:2/4
K:D
['f2 f e/f/ gf ed cd ef', 'g/a/ ba gf g2 g f/g/ ag']  
X:1
L:1/8
M:2/4
K:D
|: f2 f e/f/ | gf ed | cd ef | dA FA | f2 f e/f/ | gf ed | cd ef |1 d2 d2 :|2 d2 d |: f | 
 a2 a g/a/ | ba gf | g2 g f/g/ | ag fe | f2 f e/f/ | gf ed | cd ef |1 d2 d :|2 d2 d2 ||  