Transposition is the writing of music at a different pitch than sounding pitch.
It is used in certain instruments to simplify notation making it easier to read by players.
These instruments are called “transposing instruments” who read a part that is transposed to a different interval than the concert pitch.
In other words, a written C4 (middle C) on the page will not produce a sounding C4 if the instrument is transposing, it will produce something else depending on the instrument.
Look at above example. The first example is in written pitch/transposed pitch (the one in E major key) . The 2nd example is in sounding pitch/concert pitch (the one in D major key)
How would we write this part for Clarinet in B-flat? Since the instrument is in B-flat, then we must transpose it by a Major 2nd lower.
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