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The Firesign show from London in late 2005 is being replayed
on BBC Radio 4 on Wednesday 11:30 - midnight PM London time;
you can listen live on the BBC website, which should be
6:30 PM Eastern/3:30 PM Pacific time on Wednesday:

The Firesign Theatre Live

Wednesday 30 August 2006 23:30-0:00 (Radio 4 FM)

Comedian Mark Thomas hosts an exclusive show for Radio 4 at the London
Comedy Store, featuring American comedy heroes The Firesign Theatre.
Arising from the California counterculture in the late 1960s, they
became cult favourites, and in this rare British appearance, they
reprise some of their greatest routines, as well as bringing their wit
to bear on more recent events.

US Plus: We Own The Idea Of Now [TM]
  -- Firesign Theatre