Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
Q:1/8=120
M:4/4
K:G
['Bc B2 E2 E2 F2 GBAF D2']  
X:1
L:1/8
Q:1/8=120
M:4/4
K:G
|:"^A" Bc | B2 E2 E2 F2 | GBAF D2 EG | GBcB D2 AG | D2 G2 G2 :|  