Musicon / Bach / Musical education / Clavichord and the Art of Bach
-Clavichord and the Art of Bach
The clavichord was generally the medium for the composer’s private communings with his muse, because of its superiority over its fellows in expressive power; but it gave forth only a tiny tinkle and was incapable of stirring effects beyond those which sprang from pure emotionality.
The tone was produced by a blow against the string, delivered by a bit of brass set in the farther end of the key. The action was that of a direct lever, and the bit of brass, which was called the tangent, also acted as a bridge and measured off the segment of string whose vibration produced the desired tone. It was therefore necessary to keep the key pressed down so long as it was desired that the tone should sound, a fact which must be kept in mind if one would understand the shortcomings as well as the advantages of the instrument compared with the spinet or harpsichord.
It also furnishes one explanation of the greater lyricism of Bach’s music compared with that of his contemporaries. By gently rocking the hand while the key was down, a tremulous motion could be communicated to the string, which not only prolonged the tone appreciably but gave it an expressive effect somewhat analogous to the vibrato of a violinist. The Germans called this effect Bebung, the French Balancement, and it was indicated by a row of dots under a short slur written over the note. It is to the special fondness which Bach felt for the clavichord that we owe, to a great extent, the cantabile style of his music, its many-voicedness and its high emotionality.
From: H. Krehbiel’s, How to Listen to Music; excerpts, edited by Musicon