Create harmonious melodies following the given letter notation and incorporating the designated theme.
X:1
L:1/8
M:2/4
K:G
['Bd d>B ce e>g f>f ef', 'd>d ed Bd g z a>a ba']  
X:1
L:1/8
M:2/4
K:G
 d/c/ | Bd d>B | ce e>g | f>f ef | ed d/e/d/c/ | Bd d>B | ce e>g | f>f ef | gg g :: g | d>d ed | 
 Bd g z | a>a ba | a/g/f/e/ d z | d>d ed | Bd g z | a>a ba | g2 g :|  