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Signs placed at the beginning of the staff and named after the note they refer to.
Rarely used clef indicating that the line chosen (first, third or fourth) corresponds to the note C; its use is more specialized.
Key indicating that the fourth line of the staff corresponds to the note F; it is used to write notes in the middle and bass registers.
Key indicating that the second line of the staff corresponds to the note G; it is used to write notes in the middle and treble registers.