That is one healthy Mimi! Tuberculosis? Nah.Woodduck: you can find anything on Youtube! Here is a concert Horne did in '61 as a soprano:. She actually sounds a lot like Eileen Farrell here. The top was more flexible and solid, but you could tell the bottom was there if she needed it. The top was different than it was in the 67 Immolation Scene.
Horne's voice always had too much steel in it for my taste - I think she was perfect for castrato parts - but as soprano or mezzo she was an extraordinary singer.