The first is a rapid reiteration
A second type of tremolo is a variation in amplitude
Some electric guitars use a (somewhat misnamed) device called a "tremolo arm" or "whammy bar" that allows a performer to lower or raise the pitch of a note or chord, which is known as vibrato. This non-standard use of the term "tremolo" refers to pitch rather than amplitude.
Although it had already been employed as early as 1617 by Biagio Marini and again in 1621 by Giovanni Battista Riccio, the bowed tremolo was invented in 1624 by the early 17th-century composer Claudio Monteverdi and, written as repeated semiquavers (sixteenth notes), used for the stile concitato effects in Il combattimento di Tancredi e Clorinda. The measured tremolo, presumably played with rhythmic regularity, was invented to add dramatic intensity to string accompaniment and contrast with regular tenuto strokes. However, it was not till the time of Gluck that the real tremolo[clarification needed] became an accepted method of tone production. Four other types of historical tremolos include the obsolete undulating tremolo, the bowed tremolo, the fingered tremolo (or slurred tremolo), and the bowed-and-fingered tremolo.
The undulating tremolo was produced through the fingers of the right hand alternately exerting and relaxing pressure upon the bow to create a "very uncertain–undulating effect ... But it must be said that, unless violinists have wholly lost the art of this particular stroke, the result is disappointing and futile in the extreme," though it has been suggested that rather than as a legato stroke it was done as a series of jetés.
|In musical notation, tremolo is usually notated as regular repeated demisemiquavers (thirty-second notes), using strokes through the stems of the notes. Generally, there are three strokes, except on note which already have beams or flags: quavers (eighth notes) then take two additional slashes, semiquavers (sixteenth notes) take one, etc...||In the case of semibreves (whole notes), which lack stems, the strokes or slashes are drawn above or below the note, where the stem would be if there were one.|
Because there is ambiguity as to whether an unmeasured tremolo or regular repeated demisemiquavers (thirty-second notes) should be played, the word tremolo or the abbreviation trem., is sometimes added. In slower music when there is a real chance of confusion even more strokes can be used.
|If the tremolo is between two or more notes, the bars are drawn between them:
In some music a minim- (Half note) based tremolo is drawn with the strokes connecting the two notes together.
|Violin fingered tremolo; notice the joining of strokes and stems is different for different time values, and that some notes shorter than eighth notes are written out, such as the last thirty-second notes on the last beat of measure three:|
|Violin bowed-and-fingered tremolo, notated the same as fingered tremolo but without slurs and with stacc. above the staff:|