Develop a tune according to the designated alphabetic musical pattern and the provided melody.
X:1
L:1/8
M:3/4
K:Bb
['Ag f2 ec']  
X:1
L:1/8
M:3/4
K:Bb
 FE | DEFGAB | Gc c3 B | Ag f2 ec | Bd F3 E | DBFdBf | gfedcB | Ag f2 ec | B4 |]  