Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/2
K:G
['ba gfge B2 ed cBcA E2 AG', 'Bc dBgB dgBc dBgB d2 cB']  
X:1
L:1/8
M:2/2
K:G
 ba | gfge B2 ed | cBcA E2 AG | FGAB cdef | (3gba (3gfe d2 ba | gfge B2 ed | cBcA E2 AG | 
 FGAB cdef | g2 b2 g2 :: Bc | dBgB dgBc | dBgB d2 cB | cAfA cfAB | (3cBA fA c2 Bc | dBgB dgBc | 
 dBgB d2 cB | cAag fdef | g2 b2 g2 :|  