Radiohead
O'Brien uses a large collection of effects pedals, to help create Radiohead's distinct sound. Even on tracks that do not feature any guitar work, his pedals are put to use for other purposes such as altering Thom Yorke's keyboard playing (he and co-guitarist Jonny Greenwood sample Yorke's piano and vocals, respectively, with the Korg Kaoss Pad on live performances of "Everything In Its Right Place"). As well as being a self-taught guitarist, he is an accomplished drummer; though his only drum contributions for Radiohead to date have been tom drums on live performances of Hail to the Thief track "There There", a task he shares with Greenwood (though the part they play is put together on a synthesizer on the studio version)., and additional drumming on the b-side “Pearly*”.
Notable songwriting contributions to Radiohead include the opening riff on the song "Go to Sleep", and the riff that makes up the closing song on The Bends, "Street Spirit (Fade Out)". He has also written the instrumental "Meeting in the Aisle", "Lull", and the music to "Big Boots".
He mainly helps to expand on the musical framework created by Thom Yorke, and is known for his contributions to "Karma Police", (he created the effect that closes the song and his backing vocals during the chorus are an integral part of the song), "Lucky" (creating the effect that opens the song) and "Treefingers" (his guitar chords were processed electronically to sound like ambient music).
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