TonalityGUIDE - Tonal music basic theory for Undergraduates
  Startcentre  |  Reference Guide  

Key Signature
The key signature indicates which notes of the scale should be flattened and sharpened in a given piece. It lists those flats or sharps that define the main key of a piece, and if a piece modulates the key signature can change.

You may find the following links helpful:

  • Working out the key of a passage
  • a more basic introduction to key signatures from the connexions project