This song was first played on March 27, 2005 at the Ether Festival in London. The performance featured the Nazareth Orchestra with Jonny on the Ondes Martnot and Thom on vocals.

From Pitchfork:

On this track Greenwood plays the Ondes-Martenot, an electronic keyboarded developed by Maurice Martenot, a colleague of Leon Theremin. The Ondes-Martenot produces elegiac tones that sound like a cross between the warm buzz of a Rhodes piano and the resonant blare of a pipe organ. Such tones are perfect for Yorke's tremulous voice and his equally tremulous words-- "Your eyes, they turn me/ Why should I stay here?" The Orchestra joins the fray slowly, xylophones and trumpets giving way to gliding gilded strings bowed and plucked. The confluence of these swirling bits produces a bit of dissonance, with Yorke's voice rubbing awkwardly against the Orchestra near the end of the performance. Given that "Arpeggi" ends on a questioning tone-- Yorke repeating the word "escape" in a weak, wispy manner as a two-note pattern is repeatedly plucked-- that friction is no doubt intentional. Read more...