Generally speaking, a sharp or flat, especially when it's not part of the piece's [[key signature]], implies a sense of direction as to where it is leading. In this sense, an E{{music|♭}} wants to resolve downwards to a D, but a D{{music|♯}} wants to resolve upwards to an E. So when a composer changes the spelling of a note, they are indicating to the performer that the note's function has changed. Almost invariably this follows a drastic shift in harmony, making this practice one technique in which composers can change from one key to another, also known as enharmonic modulation. | Generally speaking, a sharp or flat, especially when it's not part of the piece's [[key signature]], implies a sense of direction as to where it is leading. In this sense, an E{{music|♭}} wants to resolve downwards to a D, but a D{{music|♯}} wants to resolve upwards to an E. So when a composer changes the spelling of a note, they are indicating to the performer that the note's function has changed. Almost invariably this follows a drastic shift in harmony, making this practice one technique in which composers can change from one key to another, also known as enharmonic modulation. |