I had seen and heard clips from time to time that had, as I remembered it, a musical number that included the bit of lyrics, "..in glorious Technicolor and stereophonic sound.."
I'd been wondering what that was from for some time. I had looked and used Google a few times. Tonight I finally managed to be persistent enough to get the right search keywords. I mis-remembered the lyrics. The line really goes, "...glorious Technicolor, breathtaking CinemaScope and Stereophonic Sound." It's a line from "Stereophonic Sound" by Cole Porter and the tune was in the 1957 Fred Astaire film Silk Stockings.
Once I knew that, I could look around a bit more. That didn't turn up the rest of the lyrics (I think I need to get a DVD or a sound track CD) but it did reveal this piece of information, which amuses me: 'Stereophonic Sound' from Silk Stockings, 1955. Although originally produced on the stage, where such things did not count, the film version was in glorious Metrocolor, breathtaking Panavision and Perspecta sound.