Sevish Sean Archibald Produces Electronic Dance Music Drum & Bass Jungle House Breaks With Layers Of Microtonal Harmonies. Recent Albums Include 'Harmony Hacker' 'Rhythm And Xen' And 'Horixens.' His Record Label 'split-Notes' Launched 2010 Releases Microtonal Music With A Beat. Sevish Is The Main Programmer For Scale Workshop Web App For Creating Microtonal Tunings. London UK.