Compose melodious music utilizing the prescribed letter representation and integrating the given thematic element.
X:1
L:1/4
M:4/4
K:C
['D2 ^F G A3/2 E/ G']  
X:1
L:1/4
M:4/4
K:C
 G/G/ | G E C A, | D2 ^F G | A3/2 E/ G =F | D3 G | G E C (A,/D/) | D2 ^F G | A3/2 E/ G (=F/E/) | 
 D3 (A/B/) | c c F G | A d2 D/D/ | D B c B | A3 D/E/ | F A G A, | D2 ^F G | A3/2 E/ G E | D3 ||  