That building will always be the "America Sings Building" to me. I don't remember the CoP but I sure remember America Sings.
I used to take breaks in that building or the old Mission to Mars building. I worked Midnight to 8 am, so sometimes I would nap in there during my lunch break. Sssshhhh.... The Mission to Mars at that time (93-95) still had the seats and the screen on the floor and ceiling.
We would also have our department-wide meetings in the America Sings Building.
The Mars building also had a quiet, always clean, rarely used bathroom.
Here is another little bit of my useless, but interesting, trivia.
As you all should know, the COP debuted at the 1964/65 New York Worlds Fair then was brought lock stock and barrel to Disneyland. When they turned Sings into Innvoventions, the same 1hp motor that originally turned the building was still in working order, so the original 1964 one horsepower motor is still being used to turn the building today. The outer ring that turns, is so perfectly balance that one horsepower is all that's needed. In addition, the outer room rides on a wooden track, protions of which are from the track used in 1964. Most of that wood rotted away during the years it sat imobile, but one or two sections surevived, so they were used, along with that motor, as a hidden tribute to the original attractions.
It was to have been turned into a "Crashed Flying Saucer" in Tomorrowland and the ET's where trying to raise money to get back to wherever they came from, and so opend the suacer and put on shows to raise the money. I saw paintings of about a year before the "New" Tomorrowland started contruction. It was another thing that the tight budget (from Pressler) killed and so it became the thing it is today. A nice place to get out of the heat.