Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:6/8
K:D
['a/g/ fdd ded cAB', 'd2 A dfa afd dfa a2 f']  
X:1
L:1/8
M:6/8
K:D
 a/g/ | fdd ded | cAB =c2 d | =cAG{A} GFG | Add d2 a/g/ | fdd ded | cAB (=c2 d) | =cAG{A} GFG | 
 Add d2 |: A | dfa afd | dfa a2 f | gag{a} gfg | ecd efg | Afd ded | cAB =c2 d | =cAG{A} GFG | 
 Add d2 :|  