Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:D
['df/e/ dc B2 A2 BA/B/ cB/c/', 'd2 d2']  
X:1
L:1/8
M:2/4
K:D
 A | df/e/ dc | B2 A2 | BA/B/ cB/c/ | dAFD | df/e/ dc | B2 A2 | BA/B/ cB/c/ | d2 z x :: f | efgf | 
 edcd | e2 e2 | e3 d | efgf | edce | d2 d2 | d2 z x :|  