A key signature is the placement of sharps or flats at the beginning of a piece of music which determines what the key of a song is and unlike the time signature it is repeated every line; here is a list of all the possible keys you can write in:
C Major/a minor (no sharps and no flats)
Sharp Keys:
G Major/e minor (1 sharp)
D Major/b minor (2 sharps)
A Major/f♯minor (3 sharps)
E Major/c♯minor (4 sharps)
B Major/g♯ minor (5 sharps)
F♯ Major/d♯ minor (6 sharps)
C♯ Major/a♯ minor (7 sharps)
Flat Keys:
F Major/d minor (1 flat)
Bb Major/g minor (2 flats)
Eb Major/c minor (3 flats)
Ab Major/f minor (4 flats)
Db Major/bb minor (5 flats)
Gb Major/eb minor (6 flats)
Cb Major/ab minor (7 flats)
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The key signature indicates which notes are sharp, natural, or flat. Every key has a specific signature.
It comes before the time signature. The clef comes before the key signature.
D major has a key signature of F sharp and C sharp D minor has a key signature of B flat
There are no sharps or flats in the key signature of C Major.
The key signature will come right after the clef on a staff.