Build a musical number by combining the given character designation and the presented melodic structure.
X:1
L:1/8
Q:1/2=100
M:2/2
K:Bb
['B2 B2', 'd2 d2']  
X:1
L:1/8
Q:1/2=100
M:2/2
K:Bb
 fd | B2 B2 B2 AB | c2 c2 c2 ec | BAGF GBAc | Bcde fdec | B2 B2 B2 AB | c2 c2 c2 ec | BAGF GBAc | 
 B2 B2 B2 :: Bc | d2 d2 d2 cd | e2 e2 e2 ge | c2 c2 c2 Bc | d2 d2 d2 fd | B2 B2 B2 AB | 
 c2 c2 c2 ec | BAGF GBAc | B2 B2 B2 :|  