Do good things come in small packages? Audio technology over this past half century offers pretty good evidence that they do. Fifty years ago, the long-playing record amazed people with a half-hour of music per side, compared to the 78's few minutes. Thirty years ago, the cassette tape replaced bulky open reels, ushering in a new era of recording capability—and portability—for millions of people. Twenty years ago, the CD began to push the LP out of the way because it packed a little more music into a much smaller and more durable package. Personal radios have long been hugely popular, and portable audio players are consistently among the industry's best-selling products.
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