dio's voice is amazing. The whole premise of this hellthread now was objectively talent vocals, not just good sound, or a sound that fits. That is the knock against Rush and many rock bands. They have a good sound, they make good songs, but in a vacuum, the singers voice is actually kind of garbage.

Dio's voice is actually probably not "good" but it is extremely unique and talented and I loved every solo song he wrote.

https://youtu.be/360xvnsduDg