Watch Kate Nash and friends perform a tribute to the musical episode of Buffy

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Continuing Joss Whedon's trajectory from nerd icon to slightly more mainstream nerd icon to legitimately mainstream (though still very nerdy) icon, Kate Nash and friends performed a full-length Halloween tribute to "Once More With Feeling," the musical episode of Buffy The Vampire Slayer, at London's Hackney Picturehouse on Wednesday night.