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
['d2 dg edcB', 'G4 d2 de dBGB c2 e2 e2']  
X:1
L:1/8
M:4/4
K:G
|: d2 dg edcB | d2 dg edcB | DGBG DGBG | DGBG cBAG | d2 dg edcB | d2 dg edcB | gfga ecAF | 
 G2 GG G4 :: d2 de dBGB | c2 e2 e2 AB | c2 cd cBAG | cdef g2 ga | fdeg fdef | gfga gfed | 
 gfgd ecAF | G2 GG G4 :|  