Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/2
K:Dmix
['f2 f2 (gf)(ed)', 'f2 f2']  
X:1
L:1/8
M:2/2
K:Dmix
 d2 e2 | f2 f2 (gf)(ed) | BcdB (BA)(GF) | A2 (AB) (AB)(de) | f2 e2 e2 (de) | f2 f2 (gf)(ed) | 
 (Bc)(dB) (BA)(GF) | A2 (AB) ABce | f2 d2 d2 || de | f2 f2 (gf)(ed) | g2 g2 g2 (fg) | 
 a2 a2 (ba)(gf) | f2 e2 e2 (de) | f2 f2 gfed | (Bc)(dB) BAGF | A2 (AB) ABde | f2 d2 d2 ||  