Two hundred fifty-sixth note

A Two hundred fifty-sixth note/256th note (American/German terminology), or a demisemihemidemisemiquaver (British/Classic terminology), is a musical note worth 1/256 of a semibreve/whole note.
256th notes are exceptionally rare, obviously more so than one hundred twenty-eighth notes. Likewise, a 256th rest is virtually unknown, but no evidence says that neither of them don't exist.
To perform a 256th note, even with a tempo setting of extremely low, would be incredibly difficult to perform on any instrument, requiring dedicated practise to one's speed, and therefore is most likely only performed in computer music. As a benchmark, 256th notes at only 25 beats per minute would have a speed of about 26.7 notes per second.
A two hundred fifty-sixth note is written singularly with a filled-in oval note head, a straight note stem, and six flags. Thus they can be written adjacently with the six flags as connected as beams. Notes shorter than this are almost never found in written music, as they are nearly impossible to perform with any classical instrument.
 
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