When a flat symbol (♭) is added to a note of music, the element of music that will MOST likely be affected is the Pitch. This is further explained below.
Generally, Pitch is simply defined as the degree of high or lowness of a tone that is determined by the rate at which it is produced; the quality of sound it produces.
In conclusion, Pitch is most likely to be affected when a flat sign (b) is introduced to a musical note.
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