- A symbol indicating which line of a staff represents the pitch of middle C. On the bottom line it becomes the soprano clef, on the middle line the alto clef, and on the third line above the bottom the tenor clef.C谱表：表明五线谱中代表高中音C的那一行符号。在第一线上时，它是高音部谱号，在第三线上时，是中音部谱号，在第四线时是次中音部谱号