Jonathan Richard Guy "Jonny" Greenwood is an English musician and composer best known as a member of the rock band Radiohead. Beyond his primary roles as Radiohead's lead guitarist and keyboardist, Greenwood is a multi-instrumentalist and also plays viola, harmonica, glockenspiel, ondes Martenot, banjo and drums, and works with computer-generated sounds and sampling; he is also a computer programmer and writes music software used by Radiohead. Noted for his aggressive playing style, Greenwood is consistently named as one of the greatest guitarists of all time.