Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
M:4/4
K:A
['a2 ef', 'c2 ec']  
X:1
L:1/8
M:4/4
K:A
|: a2 a2 ef a2 | ef ae fa ef | a2 a2 ef ae | fa ec B2 A2 :: c2 ec de fd | c2 ec Bc dB | 
 c2 ec de fg | af ec B2 A2 :|  