Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/4
M:4/4
K:G
['G G', 'D G']  
X:1
L:1/4
M:4/4
K:G
 D | G G G A | B/A/B/c/ d B | c B/G/ A A | G3 :| G/B/ | d3/2 e/ d/c/ B/A/ | G/A/ B/c/ d D | 
 G B A G | D2 z D | G G G A | B/A/B/c/ d B | c B/G/ A A | G3 ||  