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Vinyl Records
Sound waves were directed into the diaphragm, making it vibrate. A hand crank turned the cylinder to rotate the tinfoil cylinder while the needle cut a groove into it to record the sound vibrations from the diaphragm. The output side of the machine played the sound through a needle and an amplifier -
Cassette Tapes
In the early years sound quality was mediocre, but it improved dramatically by the early 1970s when it caught up with the quality of 8-track tape and kept improving. The Compact Cassette went on to become a popular (and re-recordable) alternative to the 12-inch vinyl LP during the late 1970s. -
Audio CD
An Audio CD is a music CD like that you buy in a music store. It can be played on any standard CD player (such as a CD deck, or your car CD player, or a portable CD player). Music is stored on Audio CDs as uncompressed digital data, no data is lost and quality is very high, exactly as in WAV digitally encoded files. -
MP3 Player
An MP3 player or Digital Audio Player is an electronic device that can play digital audio files. It is a type of Portable Media Player. The term 'MP3 player' is a misnomer, as most players play more than the MP3 file format. -
Cell Phones
Mobile music is music which is downloaded or streamed to mobile phones and played by mobile phones. Although many phones play music as ringtones, true "music phones" generally allow users to stream music or download music files over the internet via a WiFi connection or 3G cell phone connection.
