The Petra Zone

I do have rock chart info but its not in a published format so I'll work on that later, but here is the CCM CHR chart info. For those not familiar, CHR chart is hotter than AC, comparable to top 40 format in mainstream. Way FM for example was (at least through the 90's) a leader in the CHR format.

Here is Petra's Adult Contemporary CCM Chart history.

Take a look at this review of BTS from Musicline (industry mag of CCM in 1985) What do they mean there is no trademark Ballad on BTS? What do you call "Hollow Eyes".

This should be definitive proof. From the January 1985 industry trade Musicline magazine by CCM.