Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
['dBAB D2 FB', 'dfaf gfed']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
 dBAB D2 FB | ADFD EDB,E | dBAB D2 FB | AFEF D/E/D D2 :| dfaf gfed | egfd eB B2 | dfaf gfed | 
 edfe d/e/d d2 | d2 a2 g2 f2 | egfd ecdB | A2 AG FAdB | AFEF D/E/D D2 ||  