Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:4/4
K:D
['DCDF EDCE DCDF Adfa', 'D2 EF GFED CEA,C D2 FA BDGB']  
X:1
L:1/8
M:4/4
K:D
|: DC | DCDF EDCE | DCDF Adfa | gfef fedf | edcB AGFE | DCDF EDCE | DCDF Adfa | gfed eAGE | 
 FD D2 D2 :: EF | GFED CEA,C | D2 FA BDGB | A^GAd faff | edcB AGFE | DCDF EDCE | DCDF Adfa | 
 gfed eAGE | FD D2 D2 :|  