Jonathan Richard Guy Greenwood (born 5 November 1971) is an English musician and composer, best known as a member of the English alternative rock band Radiohead. Greenwood is a multi-instrumentalist, but serves mainly as lead guitarist and keyboard player. In addition to guitar and keyboard, he plays viola, xylophone, glockenspiel, ondes martenot, banjo, harmonica and drums. He also does work on the electronic side of Radiohead, working on computer-generated sounds and sampling. He wrote the soundtracks of the films Bodysong, There Will Be Blood, and Norwegian Wood as well as serving as "composer-in-residence" for the BBC Concert Orchestra. He is the younger brother of fellow Radiohead member, Colin Greenwood.
Noted for his aggressive playing style, Greenwood is consistently named as one of the greatest guitarists of the modern era. Citing his work with Radiohead, Channel 4 described Greenwood as a "significant creative force within the music industry."