a sketch by Yorke, which is harmonically developed by Jonny Greenwood before the rest of the band develop their parts. Whereas Yorke has never learnt to read sheet music, Greenwood is trained in music theory; in Pitchfork, Ryan Dombal wrote that "the duo's left brain-right brain dynamic has proven to be one of the most adventurous in rock history". All the band members have a role in arrangement. While Greenwood plays most lead guitar parts, O'Brien often creates ambient effects, making extensive use of effects units. The band often try several approaches to songs, and may develop them over years; for example, Radiohead first performed "True Love Waits" in 1995 before releasing it in a different arrangement on A Moon Shaped Pool in 2016. Greenwood said he saw Radiohead as "just a kind of an arrangement to form songs using whatever technology suits the song", be it a cello or a laptop. The Kid A and Amnesiac sessions brought a change in Radiohead's music and working methods. Since their shift from conventional rock instrumentation toward electronic sound, the members have gained flexibility and often switch instruments. On Kid A and Amnesiac, Yorke played keyboard and bass, Jonny Greenwood played ondes Martenot, Colin Greenwood worked on sampling, and O'Brien and Selway worked with drum machines and digital manipulation. In 2004, Yorke said that where his power in the band had been "absolutely unbalanced" and that he would "subvert everybody else's power at all costs", later albums had been more democratic. Themes and lyrics Yorke is Radiohead's lyricist. Though his early lyrics were personal, from Kid A he experimented with cutting up words and phrases and assembling them at random. He deliberately uses cliches, idioms and other common expressions, suggesting "a mind consumed by meaningless data". The New Republic writer Ryan Kearney speculated that Yorke's use of common expressions, which he described as "Radioheadisms", was an attempt "to sap our common tongue of meaning and expose the vapidity of everyday discourse". According to Yorke, many of his lyrics are motivated by anger, expressing his political and environmental concerns and written as "a constant response to doublethink". Pitchfork wrote that Yorke's lyrics on A Moon Shaped Pool were less cynical, conveying wonder and amazement. Yorke dismissed accusations that Radiohead make "depressing" music, saying in 2004: "Depressing music to me is just shit music. It's like air freshener – just a nasty little poison