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The tone represented by a note on the first ledger line below a treble clef or the first ledger line above a bass clef. It is the first C below international pitch.
(Music, other) music the note graphically represented on the first ledger line below the treble staff or the first ledger line above the bass staff and corresponding in pitch to an internationally standardized fundamental frequency of 261.63 hertz
the musical note indicated by the first leger line above the bass staff and the first below the treble staff.