Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:Eb
['G F']  
X:1
L:1/8
M:2/4
K:Eb
 c B c G | B2 B2 | G B c e | B4 | f3/2 f/ e2 | f g/ f/ e2 | G B c e | B4 | G2 e2 | c c2 d | 
 c d c B | c3 d | c B A G | F4 | G2 c2 | G2 B2 | G F G B | G3 B | G F E F | E4 | G F E F | 
 G F E F | G F E F | E4 |]  