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Here are the most common situations that may require you to change the key of a piece of music:
- To put it in the right key for your vocalists. If your singer or singers are struggling with notes that are too high or low, changing the key to put the music in their Range will result in a much better performance.
- Instrumentalists may also find that a piece is easier to play if it is in a different key. Players of both bowed and plucked strings generally find fingerings and tuning to be easier in sharp keys, while woodwind and brass players often find flat keys more comfortable and in tune.
- Instrumentalists with transposing instruments will usually need any part they play to be properly transposed before they can play it. Clarinet, French horn, saxophone, trumpet, and cornet are the most common transposing instruments.