1.33 bass clef ============== ES: clave de fa en cuarta, I: chiave di basso, F: clef de fa quatrième ligne, D: Bassschlüssel, NL: bassleutel, DK: basnøgle, S: basklav, FI: bassoavain. A clef setting with middle C on the first top ledger line. See also ........ F clef.