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
['BcdB G2', 'Bcde dBGB']  
X:1
L:1/8
M:4/4
K:G
 dc | BcdB G2 GF | GBAF G2 dc | BcdB G2 AG | FGAB cAdc | BcdB G2 GF | GBAF GABc | dBcA BGAG | 
 FGAB cA || dc | Bcde dBGB | dg g2 bg g2 | Bcde dcBc | Aaaf gedc | Bcde dBGB | defa g2 fg | 
 afdg ecAG | FGAB cA ||  