Most of Bach's keyboard output is 'instrument neutral', meaning that it can be played on any available type of keyboard instrument: harpsichord, clavichord, fortepiano, or organ; but some pieces call for specific instruments either explicitly (the organ sonatas of Wq 70, or the "Bogenclavier" sonata, Wq 65/48) or implicitly (pieces that call for Bebung
and other clavichord-specific techniques).
Thus the challenge is not so much to produce yet a nother Ninth, this time more in tune with HIP, but rather to appreciate Carl Philipp Emanuel Bach's Bebung
, Clementi's legato, and portamento in Louis Spohr's Fifth, not to mention the tempo rubato of Willem Mengelberg's Mahler.
28) Most likely she refers to what was known in German-speaking countries as Bebung
Both work well (Simmonds employs bebung
where Butt uses the organ tremulant
The force of striking the key doesn't any longer necessarily have anything to do with loudness, but instead can--according to the programming--bring about tone-color alterations, or degrees of amplitude and frequency modulation; or a note may begin at some point to glide, responding to the key pressure, more or less rapidly, like the Bebung
on clavichords in the Baroque.
Christopher Hogwood presents a survey of late eighteenth-century works prescribing the use of Bebung
, the vibrato possible on the clavichord alone among keyboard instruments, and the related portato or Tragen der Tone.
But when this sign was written over a single note rather than a group of notes it signified the Bebung
(repeated pressure made without lifting the key, which affects the steadiness of pitch of the note).