Build a musical number by combining the given character designation and the presented melodic structure.
X:1
L:1/8
M:4/4
K:Amix
['AAAB c2']  
X:1
L:1/8
M:4/4
K:Amix
|: AAAB c2 cB | c2 cB ce f2 | AAAB c2 af | ecBc AAAa :|  