In musical notation, a set of sharp or flat symbols placed together at left side of each staff, effectively indicating the default pitch class set of the notes to follow.

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How can I easily translate between a key and a key signature?

Is there a good mnemonic or trick for working out the key signature from a given key? I can always write out the chromatic scale, then count out the appropriate intervals from the tonic, and figure ...
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1answer
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A peculiarity in John Tompson's first grade book regarding key signatures

Back in the days when I was studying from John Thompson's First Grade Piano book, I had come across a peculiarity which I could not understand: in pages 13-15 there are pieces which are in the key of ...
11
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4answers
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Equivalent Key Signatures

I've noticed that a variety of pieces in the classical repetoire (certainly at least the piano repetoire), label what seems to be effectively the same key signature differently. That is, I am not ...
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9answers
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Key signature for writing in modes other than major and minor

I have trouble deciding what accidentals to put in the key signature for pieces in Dorian, Phrygian, Lydian or Mixolydian modes. There seem to be trade-offs associated with each choice. For example, ...