That's a great song. It didn't chart nationally, but it should have.
There’s plenty of songs that didn’t chart nationally that are worth listening to. Especially when the charting music in the contemporary era is so lacking.
There were times that competition was fierce for “number one”. Some real good “#2 or #3” chart hits (and again, some that never made the charts).
Plenty of crud went up the charts as well.
I don’t know if there’s a whole album (legit release or grey market compilation) yet of Dio’s pre-metal recordings but there are a number of them on the youtube.