The search for "walls" delivered 3 verses in 3 songs on 3 records.
The dragon searched for the following: "walls" as keywords
Here are the matching verses:
Black Sabbath: Dehumanizer
1. Computer God
Chorus:
There's another side of heaven
This way - to technical paradise
Find it on the other side
When the walls fall down
Dio: Angry Machines
1. Institutional Man
Inside the walls I've made
To keep out all who reach for me
I might have lost my way
And I can't come out again
Dio: Killing The Dragon
5. Rock And Roll
If you're there when the walls come down
We all sing - warrior
Is there sight without sound
Most unlikely