What's holding arpeggiated chords in piano called?

Question

What does this technique called? Also, what's the proper notation for this? The audio link is attached below.

https://voca.ro/19p4jeWEK5g8

Edit: It sounds like fast arpeggio repeated over and over again with the same voicing.

Answer 1

Adding to Aaron’s answer some notation remarks: In orchestral music such a between-two-notes tremolo is usually notated by notating the two notes in question with double length and putting tremolo beams between them.

In piano notation there is a special notation for this, where the tremolo beams attach to the stems of the notes, making it look like it was a pair of small notes with note heads from large notes. This is only really used for a total length written with a half note, as a whole note would look weird, and black notes allow for no distinguishing between smaller note values (so a 32th tremolo lasting a quarter would look just like 32th notes). Thus for such cases there is a notation where the first beam is attached to the stems, while the other beams are not.

Here is how these three variants look:

Answer 2

It's called a "shake", "tremolo", or "tremolando".

• Shake: this term is most often used by jazz or blues players, and is IMO the most descriptive.
• Tremolo: probably the most common term, though some musicians use it to mean repetition of a single note.
• Tremolando: less common, and technically a synonym for "tremolo", but some musicians use it to mean repetition between multiple notes.

To get the specific effect, it's probably most clear to write "shake", "trem.", or "tremolo" above the notated chord.

"Tremolo bars" are also fine.

One can also use a trill line to indicate duration.