Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/16
Q:1/4=60
M:4/4
K:G
['dBdgf2e2 eceag2f2 fefga2ab']  
X:1
L:1/16
Q:1/4=60
M:4/4
K:G
 dBdgf2e2 eceag2f2 | fefga2ab agfed2d2 | dBdgf2e2 eceag2f2 | fefga2ab agfe2<d2g | 
 f2e2c2>e2 d2G2B2>d2 | c2A2G2B2 GDGBdBdg | f2e2c2>e2 d2G2B2>d2 | c2A2G2B2 G2G2 G4 |]  