Meaning of the word "key signature" in English

What does "key signature" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

key signature

US /ˈkiː ˌsɪɡ.nə.tʃər/
UK /ˈkiː ˌsɪɡ.nə.tʃər/
"key signature" picture

Noun

1.

any of several combinations of sharps or flats on a musical staff at the beginning of a composition, indicating the key in which the composition is written

Example:
The pianist checked the key signature before starting the piece.
Changing the key signature alters the pitch of many notes.
Synonym:
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