Develop tuneful melodies adhering to the specified letter notation and including the supplied thematic aspect.
X:1
L:1/8
M:2/4
K:C
['|{fg} fe e/f/e |{ef} ed d/e/d', 'g/a/b/c dd b2 bcba a/b/a']  
X:1
L:1/8
M:2/4
K:C
 c | B>c df |{fg} fe e/f/e |{ef} ed d/e/d |{de} dc c/d/c | B>cdf |{fg} fe e/f/e |{ef} ed d/e/d | 
 ccc :|[K:G] d | d(e/f/) g/a/b/c | dd b2 | bcba a/b/a | ag g/a/g | de/f g/a/b/c | dd b2 | 
 bcba a/b/a | gbg :|  