Van Der Graaf Generator: Royal Festival Hall, London

WHEN THE FOUR core members of this almost-forgotten prog-rock band start a gig for the first time in 29 years, a joyous roar bounces round the auditorium. That's how much Van der Graaf Generator mean to a small but fanatical section of their Seventies generation, and those, such as ex-Blur guitarist Graham Coxon, who have joined the cult since.