Addition to my first post
As an alternative you could add a character not with classical music, but a character with a guitar. an interesting concept was shown by Voxelthelslime.
This character would also fit well into the universe of the game and would be cheerfully played.
Ideas from myself...
It looks like Valve is going to add a “musical” character, according to their work on the test character: “selecthero hero_cadence”.
AI concept art. Similar in height to an "Ivy" or a "baby invoker".
There is a lot of room to go wild with a musical character and his style. but I think we...