Produce pleasing melodies that correspond with the indicated letter notation and incorporate the suggested theme.
X:1
L:1/8
M:2/4
K:C
['ef g2', 'de fd']  
X:1
L:1/8
M:2/4
K:C
 ed ed | ef g2 | de fd | ef g2 | ed ed | ef g2 | de fd | c2 c2 :: de fd | ef g2 | de fd | ef g2 | 
 ed ed | ef g2 | de fd | c2 c2 :|  