Flat (music)
In music, flat, or Bemolle, means "lower in pitch." In music notation, flat means "lower in pitch by a semitone (half step)," and has the symbol (♭).[1] The Unicode character '♭' (U+266D) is the flat sign. Its HTML entity is ♭.
Under twelve tone equal temperament, C flat is the same as, or enharmonically equivalent to, B natural, and G flat is the same as F sharp.
Double flats also exist, which look like 
and lower a note by two semitones, or a whole step. Sometimes you will encounter half or three-quarter flats. The Unicode character '𝄫' 𝄫 (U+1D12B) represents the double flat sign.
A triple flat can be found, but it is very rare. It lowers a note three semitones.
The note A flat is shown in musical notation in Figure 1, together with A double flat. 
An A and an A flat (info • help)
In tuning, flat can also mean "slightly lower in pitch". If the same note is played on two instruments at the same time, the lower-pitched one is flat compared to the higher-pitched one.
A half flat, showing quarter tones, is sometimes shown with a flat with a slash (
) or a reversed flat sign. A three-quarter flat is represented by a half flat and a regular flat.
Related pages
References
- ↑ "Music Symbols on Concrete Blockers". Archived from the original on 2010-02-26. Retrieved 2010-03-10.