I’m not sure they ever reached a fourth chord: Spiritualized, at the Roundhouse, reviewed

Every so often, Jason Pierce drifts into focus. It happened at the end of the 1980s, when his then group Spacemen 3 (motto: ‘Taking drugs to make music to take drugs to’) suddenly and briefly went from being those weirdos from Rugby to one of the defining groups of English alternative rock thanks to their album Sound of Confusion (there’s a whole strain of American psychedelia that is explicitly indebted to their two-chord drone).