Jonathan Richard Guy "Jonny" Greenwood (born 5 November 1971) is an English musician and composer best known as the lead guitarist and keyboardist of the alternative rock band Radiohead. Noted for his aggressive playing style, which features heavy use of effects, melodic arpeggios - often played in unusual time signatures - and unique use of noises and feedbacks (particularly from the album Kid A onward), Greenwood is considered by many to be one of the greatest guitarists of all time.
A multi-instrumentalist, Greenwood also plays instruments including the bass guitar, drums, viola, harmonica, and the ondes Martenot, an early electronic instrument. Along with the other members of Radiohead, he also works with electronic instruments and techniques such as programming, sampling and looping, and writes music software used by Radiohead.
Greenwood composed the soundtracks for the films Bodysong (2003), There Will Be Blood (2007), Norwegian Wood (2010), We Need To Talk About Kevin (2011), The Master (2012) and Inherent Vice (2014), and serves as composer-in-residence for the BBC Concert Orchestra. He is the younger brother of Radiohead bassist Colin Greenwood.