Answer:
1. a natural is an accidental which cancels previous accidentals and represents the unaltered pitch of a note.
2. flat means "lower in pitch by one semitone (half step)", notated using the symbol ♭ which is derived from a stylised lowercase 'b'. ... For instance, the music below has a key signature with three flats
3. A g clefsymbol located at the beginning of a staff to indicate the pitches of the notes placed on the lines and spaces of the staff.
4. Also known as the bass clef, the F clefis used to indicate pitches below middle C. The pitch "f" is indicated by placing a note on the 4th line.
