Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
['G F2 G ABc d2 e f2', 'f2 d']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:D
|: G | F2 G ABc | d2 e f2 d | c2 A Bcd | e3 E2 G | F2 G ABc | d2 e f2 d | c2 A ABc | d3 D2 :: g | 
 f2 d f2 d | f3 e2 g | f2 d d2 f | ecA A2 g | f2 d def | g3 e2 d | B2 g ecA | d3 D2 :|  