Develop melodies utilizing the stated letter notation and the provided theme.
X:1
L:1/8
M:3/4
K:Bb
['gfdBec BdFdBd', 'd2 f2 f2 d2 b2 b2', "defec'e defec'e"]  
X:1
L:1/8
M:3/4
K:Bb
 df | gfdBec | BdFdBd | ceFece | dcBdgf | gfdBec | BdFdBd | ceFece | B4 :: de | d2 f2 f2 | 
 d2 b2 b2 | ac'e'c'ac' | babd'de | d2 f2 f2 | d2 b2 b2 | ac'e'c'ac' | b4 :: fe | defec'e | 
 defec'e | dfbfd'f | dfbfd'f | defec'e | defec'e | debd'c'a | b4 :|  