Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:G
['dd d/B/G/B/']  
X:1
L:1/8
M:2/4
K:G
|:"G" dd d/B/G/B/ | dd d/B/G/B/ |"C" c>c"G" B>B |"D7" AA"G" G2 ::"D7" AA DD |"G" GB d2 | 
"C" c>c"G" B>B |"D7" AA"G" G2 :|  