Develop a tune according to the designated alphabetic musical pattern and the provided melody.
X:1
L:1/8
M:12/8
K:Bmix
['', 'F F2 B Bcd c2 B B2', 'e2 g b2 g']  
X:1
L:1/8
M:12/8
K:Bmix
[K:B] F |: F2 B Bcd c2 B B2 d | f2 b gfd f3 f2 F | F2 B Bcd c2 B B2 d |1 fgf fed c3 cBG :|2 
 fgf fed c3 c2 d || e2 g b2 g f2 d dcB | e2 g b2 g f3 f2 d | e2 g b2 g f2 d dcB | fgf fed c3 c2 d | 
 e2 g b2 g f2 d dcB | e2 g b2 g f3 fga | b2 c' bag f2 d d2 e | fgf fed c3 cBG ||  