Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:4/4
K:G
['edBG Bg', 'BgBg g/f/e/d/']  
X:1
L:1/8
M:4/4
K:G
|: edBG Bg B2 | edBG Bg A2 | edBG Bg B2 | egfa gB A2 :: BgBg g/f/e/d/ gd | BgBg g/f/e/d/ A2 | 
 BgBg g/f/e/d/ gd | egfa gB A2 :|  