Music is the best form of entertainment for individuals who work for long hours and the type of music is usually chosen by the listener based on his mind set. Music can be stored in cassettes, compact disks and digital disks.
In year 1980, mostly music was stored in cassettes and it is reported that more than 150 million of cassettes were sold to music lovers. By year 2000, the usage of cassettes has been decreased gradually by raising the usage of compact disks to store music.
Until mid 1980's , the sale of music in compact disks was very less and in year 1990, 250 million CD's were sold world wide and by the year 2000, the sales of music through CD's has raised to 900 million. At present the count of music sales is decreasing gradually due to new invention of pen drives and memory cards.
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