Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:3/4
K:G
['Bc dD BcdD c2 ABcD B4 GA']  
X:1
L:1/8
M:3/4
K:G
 Bc | dD BcdD | c2 ABcD | B4 GA | BDGABG | A2 FGAF | G4 :|  