British artist Oliver Beer talks about how he explores the acoustical character of Kiliç Ali Paşa Hamam, a stunning Turkish bath designed more than 400 years ago by the legendary architect Sinan. Inside the hot, steamy, inner chamber of this historic space, a small group of young Turkish opera singers rehearse Beer's composition "Call to Sound." Their public performance will take place for one night only, on the eve of the 14th Istanbul Biennial.