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"I Should Have Known" is a song on the Foo Fighters' album "Wasting Light" to which Krist Novoselic contributed. Novoselic, the former bassist of Nirvana, played bass on the track, marking his first collaboration with the Foo Fighters since Nirvana's dissolution in 1994. The song showcases Novoselic's signature bass style, adding a distinct grunge element to the Foo Fighters' sound.