Develop melodies adhering to the specified musical structure and using the offered theme.
X:1
L:1/8
M:2/4
K:Bb
['B2 df', 'DFBF dFBF'  
X:1
L:1/8
M:2/4
K:Bb
 (3ABc | B2 df bdfd | B2 df gdfd | B2 df bdfd | cBcd BGGA | B2 df bdfd | B2 df gdfd | bdgd gdBd | 
 cBAc B2 :: FE | DFBF dFBF | DFBF dFBF | EGBG eGBG | EGBG eGBG | DFBF dFBF | DFBF dFBF | 
 EGBe dcBd | cBAc B2 :|  