Sony CDP-101 (1982)

 The first commercial compact disc player signaled a technological sea change that ultimately caused millions of music lovers to ditch their turntables. The boxy CDP-101 wasn't especially sleek, and at $900 it was priced for audiophiles, but it ushered in the age of digital sound--no more hisses, scratches, pops, or skips. Now, with SuperAudio CD and DVD-Audio offering vastly superior sound, and MP3 downloads dominating music sales, CD players may eventually join turntables and 8-track machines (#46) as relics of our audio past. But they will sure have sounded good while they lasted.