My vote for best Nirvana imitation in a world chock full of them: Zion, Illinois's Local H, comprising singer-guitarist-bassist Scott Lucas and drummer Joe Daniels. Implosive power, hidden hooks, fuck-you attitude--they've got everything but the tortured genius, which I wouldn't wish on anybody. The album, their second: As Good As Dead (Island). 
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http://www.robertchristgau.com/xg/play/1996-04.php