Bebung

Bebung (German: a trembling; [ˈbeːbʊŋ]) is a type of vibrato executed on the clavichord.

By applying a rocking pressure up and down the key with the finger, a performer can slightly alter the tension of the string itself, producing the vibrato quality known as bebung.

For example: [1] Carl Philipp Emanuel Bach called the vibrato "Bebung", however other composers like Johann Mattheson had described the term earlier on.

C.P.E Bach often used Bebung in his music, and says it was one of the reasons why the clavichord was superior to the recent pianoforte.

In 1789, Daniel Gottlob Türk added the Bebung definition to the pianoforte, yet instead of the rocking-pressure, it is restating the tone/note by continuously and gently pressuring it.