A blackened musical notation, also called a black MIDI, black score and black sheet (Japanese: 黒楽譜, くろがくふ, Kuro Gakufu, literally "black sheet music") is an experimental genre of music that uses MIDI files, to compose a song remix composed of a large number of notes (typically in the thousands all the way into the millions). It is usually done by filling up the sheet with thousands or millions of abnormally short notes, depending on style. A completed black MIDI will look like a recklessly colored and scribbled drawing on ruled paper if adapted to a score sheet. Most blackened songs are made from existing songs, although there are a few original compositions floating around the Internet. It is somewhat uncommon to have an originally composed black MIDI as many artists tend to use a playable piano transcription as the "base" MIDI. The word 'black' in 'Black MIDI' refers to the notation's typical appearance.