I mention this because the HomePod's "smart" features—its integration with Siri and the Apple Music streaming service—is a big part of its appeal. In its natural element, the HomePod provides a way of accessing music that, although as old as our century, to me is still new and unfamiliar: Forget your hoary music collection, your Rolling Stones and Beethoven. Decide what kind of music you want to hear—a genre or a mood—then leave the choice to Siri and her algorithmic minions.

I grew up with Gershwin's Rhapsody in Blue. I was the youngest in a family not particularly interested in music, and whose record collection consisted of pop music and three oddly assorted classical recordings, all on 78rpm discs: Enrico Caruso singing "Vesti la giubba," Stravinsky's The Rite of Spring (on four 12" 78s), and the 1927 recording of Rhapsody in Blue with the Paul Whiteman Concert Orchestra and Gershwin at the keyboard.

High Definition Compatible Digital^® (HDCD^®), the proprietary process for improving the sound of 16-bit digital audio, has finally arrived. More than a dozen digital processors using the technology are on the market, and the professional encoder used to master HDCD discs is following closely behind.