The guitarist Jonny Greenwood is Radiohead's secret weapon. The youngest member of the band, he functions as arranger, composer, and multi-instrumentalist. He is responsible for re-harmonizing and re-setting the band's songs, and in doing so incorporates ideas from jazz, modern classical music, electronic music, and reggae while finding innovative uses for a broad range of instrumentation. His compositional accomplishments outside of Radiohead are remarkable, as well. He's composed brilliant soundtracks for two films (Bodysong and There Will Be Blood), that easily stand with any modern classical compositions I've heard in the last decade. Listening to a musical artist of his caliber in a rock band is a rare treat. Roll over Beethoven? Why? He's in the group. (Suggested viewing: Search Pyramid Song: Prague DVD and These Are My Twisted Words: Prague DVD in YouTube.)