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Below is a staff. After the third bar, why the second c isn't either sharp or flat?

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I think you don't understand key signatures properly. This might help you in undertanding them: musictheory.net/lessons/24 . –  Kartik Apr 19 at 14:36
    
Thanks so much, I really hate reading wiki, for it covers so many unnecessary stuffs. This is highly encouraged. –  user139024 Apr 19 at 14:44
    
You can find many other topics and resources on that site. –  Kartik Apr 19 at 14:46

1 Answer 1

Accidentals (sharps, flats or naturals) only change notes until the end of the bar they are in. So, the C# above doesn't affect the C in the next bar. However, flats or sharps in key-signatures affect all notes in the music, for instance the Bb and Eb above, unless "overruled" by another accidental, for example the B natural above.

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I just want to add although it is unnecessary, most composers would put a natural sign next to the C as a reminder to the musician to play a C instead of a C#. –  Dom Apr 14 at 1:44
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@ Dom - yes, they do, and I feel it's clogging up the staves. It's not necessary, the bar line cancels anyway. Take it further, if there's another C in the next bar, should the writer remind us again, after all, it's another bar... –  Tim Apr 14 at 6:26
    
So what you r saying is, there is a natural sign before the first c because there is no bar before it to cancel flat signatures? –  user139024 Apr 16 at 18:28
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There's no flat in front of the C or Cb in the key signature. So, nothing to make it flat. –  Bob Broadley Apr 16 at 19:44
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I think you might be getting the signs for sharps, flats and naturals mixed up. –  Bob Broadley Apr 16 at 19:46

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