In October 2000 Radiohead released their fourth album, Kid A, the first of two albums from these recording sessions. A departure from OK Computer, Kid A featured a minimalist and textured style with more diverse instrumentation, including the ondes Martenot, programmed electronic beats, strings, and jazz horns. It debuted at number one in many countries, including the US, where it became the first Radiohead album to debut atop the Billboard chart and the first US number-one album by any UK act since the Spice Girls in 1996. This success was attributed variously to marketing, to the album's leak on the file-sharing network Napster a few months before its release, and to advance anticipation based, in part, on the success of OK Computer. Although Radiohead released no singles from Kid A, promos of "Optimistic" and "Idioteque" received radio play, and a series of "blips", or short videos set to portions of tracks, were played on music channels and released free online. Inspired by Naomi Klein's anti-globalisation book No Logo, Radiohead continued a 2000 tour of Europe in a custom-built tent free of advertising; they also promoted Kid A with three sold-out North American theatre concerts.