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I can't count the number of times I was dropped off at a multiplex cinema as a child to watch a matinee that was preceded by the now-defunct General Cinema Corporation's "projector dots" jingle. Sure it's simple, but nearly three decades after they quit using this 1977 clip, I sometimes hear its ear-wormy jingle in my head when I can't sleep.

Here's a history of General Cinema from Pleasant Family Shopping via MetaFilter.