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London's best avant-garde music festival returns this winter with another week of beautifully programmed old and new music. Ragnar Kjartansson kicks off the week with a seven-hour performance, followed by nights of live sets from Pan Daijing and Moor Mother, the premiere of a lost porno scored by Pauline Olivieros, performances by Joan la Barbara and Elaine Mitchener, and works by Robert Ashley and Chris Newman. Booking essential.