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
['DFA d2 e fdB BAF AFA dAF', 'dfa afd', 'e fdB BAF', 'dfa afd']  
X:1
L:1/8
M:6/8
K:D
 DFA d2 e | fdB BAF | AFA dAF | E3 GFE | DFA d2 e | fdB BAF | AFA dAF | DED D3 :: dfa afd | 
 gfg fef | dfa afd | cde ecA | dfa afd | gfg fef | BdB AFA | DED D3 :|"^Variations:" DFA d2 e | 
 fdB BAF | ABA AFD | EFE GFE | DFA d2 e | fdB BAF | A3 dAF | DED D3 :: dfa afd | gbg faf | 
 dfa afd | cee ecA | dfa afd | g3 faf | B/c/dB AFA | DED D3 :|  