Extratone

Extratone is a very fast form of speedcore, characterized by tempos of 1,000 beats per minute and far above, sometimes above 5,000 or 10,000, although there is always a kind of 'bottom rhythm' in it, ie: the melody is usually of a much lower tempo. Extratone between 15,000 and 1,200,000 BPM is usually called "Supertone".

Extratone has only a very small following. This music is therefore almost never sold and the number of record companies that publish extratone is nil. Most artists offer their music for free on popular music sites, through a link to a download site, or they email the songs to those who request it.

How Extratone sounds like:
Extratone goes DRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...

Faster Extratone goes EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE...

Here's an Youtube playlist with some Extratone tracks: https://www.youtube.com/watch?v=I3v_e58Q5io&list=PL0S0dZTWB0Vb_tnBZKDCkLxSPol066jqO