Construct harmonious tunes in line with the outlined letter symbolism and the presented thematic component.
X:1
L:1/8
M:4/4
K:G
['dB A2', 'fa ge dB']  
X:1
L:1/8
M:4/4
K:G
 A2 eA ^cd ef | g2 dg eg dB | A2 eA ^cd ef |1 ge dB A2 A2 :|2 ge dB A2 fg || a2 ea ca fa | 
 g2 dg Bg fg |1 a2 ea ca fa | ge dB A4 :|2 (3agf (3gfe fd fa | ge dB A4 ||  