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nginx/1.14.0 (Ubuntu) The stereo in my living room knows too much about me. It knows that I listen to cheesy love songs by Rod Stewart and that I am hooked on show tunes from the Mamma Mia! original-cast recording. It remembers which songs I play five times in a row and which ones I skip altogether. The Bose Lifestyle 48 — available in Britain next month for $7,094 — understands all this because it comes with uMusic, an "intelligent playback system" that stores hundreds of CDs on a hard drive and can learn its owner's musical tastes.

The...