Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:G
['GB BG', 'G dg g>e dB B>G FA cd', 'G dg- ga b2 ag eg ed']  
X:1
L:1/8
M:2/4
K:G
 GB B>A | GB BG | FA cd | ed B/c/B/A/ | GB B/c/B/A/ | GB BG | F>A cA | AG G :| dg g>e | dB B>G | 
 FA cd | ed B>c | dg g/a/g/e/ | dB BG | F>A cA | AG G :| dg- ga | b2 ag | eg ed | dB B>c | dg ga | 
 bc'/b/ ag |1 e/f/g ed | g2 g :|2 e/f/g dB | G3 ||  