Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/4
M:6/8
K:G
['', 'G A', 'd B']  
X:1
L:1/4
M:6/8
K:G
 D |: G2 G | A G A | B d B | A G A | B3/2 A/ G | G E D | D E G | A2 D | G2 G | A G A | B d B | 
 A G A | B3/2 A/ G | G E D | D E G |1 G2 D :|2 G2 B |: d2 e | d B G | d2 e | d B G | d B G | 
 d B G | e3/2 d/ c/B/ | A2 B/A/ | G2 G | A G A | B d B | A G A | B3/2 A/ G | G E D | D E F |1 
 G2 B :|2 G2 ||  