Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:6/8
K:G
['(3efg e', 'D GBd efg dBG AFD B2 B', 'GBd GBd']  
X:1
L:1/8
M:6/8
K:G
|: (3efg e dBG | DFA GBd | (3efg e def | gab agf | fge fed | edB c3 | B2 B GAB |1 AGF GBd :|2 
 AGF G2 D |: B2 B BAG | AGF G2 D | GBd efg | dBG AFD | B2 B BAG | AGF GBd | (3efg e dBA | AGF G3 :: 
 GBd GBd | gge dBA | GBd GBd | AFD AFD | GBd GBd | gge dBA | B2 B dcA | AGF G2 D :|  