Thanks to Amy2 for doing a little digging and finding a 7/90 article in Connoisseur Magazine that sheds light on the video.
The kindest synopsis I can give, based on testimony from various sources, is a brief one: Josh serenades Ms. Black and an old man on a stage as she smokes a cigarette. The stage hands come in, are stunned to find this scene, and then they start moving furniture and stage equipment around.
The Brahms Hungarian Dance arrangement for violin and piano is hardly what I would call ideal serenade music, and as for the whole thing about people moving stage props around... dude, okay, you know what, it's not going to kill me if I never see this video. I'm not so sure I want to know how chair-moving has anything to do with Brahms.