Construct harmonious tunes in line with the outlined letter symbolism and the presented thematic component.
X:1
L:1/8
M:4/4
K:D
['', 'd/d/d fd', 'g2 dB']  
X:1
L:1/8
M:4/4
K:D
 A |: d/d/d fd g2 dB | d/d/d fd e2 cA | d/d/d fd gefd | (e/f/).g (f/g/).a e2 cA :: g2 dB BgdB | 
 g2 dB AecA | g2 dB Bgfd | (e/f/).g (f/g/).a e2 cA :|  