Transposing music is done when there is a difficulty in playing a particular key. This allows the person to play the key. In most of the cases some of the keys might be difficult to play depending on the instrument they use. So accordingly there is a need to transpose that music to the keys that can be used comfortably. Suppose you find it difficult to play the chord C then you might transpose it to 5 semitones below so that you are playing with chord G instead. You should note that when you do transpose music you will also be transposing the accidentals too.
Now-a-days it is easy to transpose music if you are using keyboards and synthesizers. There is a key for transposing in it. All you have to do is to just mention the number of semitones to transpose by pressing that transpose key. The transpose would be done automatically. There are many websites that gives you information on transposing music.
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