Learned something new today and am fascinated by it. From Chill:
What is Black MIDI?
Black MIDI is a micro genre in music. It's created using Musical Instrument Digital Interface and it's main feature is a giant note density (sometimes this term is applied only to MIDI tracks with 1M+ note count). It is totally impossible to read it in modern musical notation form, because music sheets look almost black. Just imagine that the longest notes are 32d; some songs contain millions of abnormally short notes: sure, this music cannot be perceived normally. Usually black MIDI tracks are blackened MIDI remixes but also there are original black MIDI songs. Authors of remixes are called "blackers", usually MIDI tracks are created by "MIDI crews" - groups of blackers.
Here is an example -- 4.6 million discrete notes in 3:44:
Not all sounds made using musical instruments sound like music.