Robert Worby presents music from the BBC Scottish Symphony Orchestra's recent week of collaboration with IRCAM, the Paris centre for composition and research in electro-acoustic music. Music taken from across the week will include both acoustic and electro-acoustic composition from Boulez, Xenakis, Harvey and Maresz. Ivan Hewett also reports on David Byrne's New York City sound-art installation, Playing the Building. Go to the Hear and Now Homepage to see a video of Ivan 'playing the building'. Music to include: Pierre Boulez: Dialogue de l'Ombre Double Alain Billard, clarinet Ircam computer music design, Andrew Gerzso Ircam sound realisation, Gilbert Nouno, Jérémie Henrot Xenakis: Aroura Scottish Ensemble Guest Director, Laurent Quenelle Maresz: Metallics Laurent Bômont, trumpet Ircam computer music design, Xavier Chabot Ircam sound realisation, Gilbert Nouno, Jérémie Henrot Harvey: Excerpts & 2 Interludes from Wagner Dream Claire Booth, soprano BBC Scottish Symphony Orchestra, conductor Ilan Volkov Ircam computer music design: Gilvert Nouno; sound engineer: Jérémie Henrot