Tray Loading
Sony released the world's first CD Player called the CDP-101 in 1982 utilizing a slide-out tray design for the CD. As it was easy to use and manufacture, most CD player tray designs had followed this style of tray ever since. However there have been some notable exceptions. http://en.wikipedia.org/wiki/Compact_Disc_player
Evolution
Digital audio players (i.e., MP3) have surpassed the concept of CD changers. For example, the first generation iPod can hold an equivalent of 50 discs (1000 songs) with a 128k bit rate for each song; thereby, the iPod is 1/10 the size of a CD changer cartridge, and about 1/20 the size of a carousel changer. Solid state flash-based digital audio players have rendered compact discs and thus CD changers obsolete for some purposes. While digital audio players often use a lossy compression scheme, they usually can accept lossless formats such as WAV (PCM) as well, matching the quality of CD audio.
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