Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/8
M:2/4
K:G
['GB B/c/B/A/ GB', 'g2 g>f ga ag fd', 'B2 c2 dB']  
X:1
L:1/8
M:2/4
K:G
|: GB B/c/B/A/ | GB BA/G/ | FA DA | FA DA | GB B/c/B/A/ | GB d3/2 g/ | fd cA | G2 G2 :: g2 g>f | 
 ga ag | fd de | fg af | g2 g>f | ga ag | fd cA | G2 G2 :: B2 c2 | dB AG | FD DE | FG Ac | B2 c2 | 
 dB A>g | fd cA | G2 G2 :|  