Okay.
The clues:
"Consider the existence of God"
What's the Latin word for God?
Dio.
The other clue to who the band was: "Think of Judy Garland singing".
What's her most well-known song? "Somewhere Over the Rainbow".
Dio was a member of Rainbow and had a fascination with them; they appear in many of his songs.
The album clue was "Going down, but not to Hell".
Holy Diver.
and the song?
The original clue was: "Good advice for children".
"Don't Talk to Stangers" - Dio from
Holy Diver, 1983.
I thank you!