Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/16
Q:1/8=200
M:2/4
K:none
['', 'G2GF GABc d2de', 'g2fg a2>g2 f2d2 d2>e2 f2d2']  
X:1
L:1/16
Q:1/8=200
M:2/4
K:none
[K:G]|: D2 | G2GF GABc | d2de dBGB | A2AG ABcd | e2ed efge | G2GF GABc | d2de dcBA | Ggfe dcBA | 
 G2B2 G2 :: d2 | g2fg a2>g2 | f2d2 d2>e2 | f2d2 c2A2 | B2G2 G2d2 | g2fg a2>g2 | f2d2 d2>e2 | 
 f2d2 e2f2 | g6 :|  