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
['gbg fdd', 'G2 A B2 B cAA BGG cAA']  
X:1
L:1/8
M:6/8
K:G
 gbg fdd | ece dBG | gbg fdd | ece d2 (e/f/) | gbg fdd | ecg dBG | B2 B cAA | BGG G2 :: A | 
 B2 B cAA | BGG cAA | B2 d cAd | BGG G2 A | B2 B cAA | BGG cAA | B2 d cAd | BGG G3 :|  