Singer Bobby McFerrin, visiting the UK to take part in Ornette Colman's Meltdown festival at the Royal Festival Hall in London, meets Mark Lawson to discuss audience participation and his new wordless and improvised opera, Bobble. Mark Lawson visits the Ruthin Craft Centre in Denbighshire to hear from artist Andrew Logan and the centre's director, Philip Hughes, about why the gallery has been shortlisted for this year's Art Fund Prize for Best Museum and Gallery in the UK. Following the High Court's ruling that anonymous bloggers have no right to keep their identities secret, lawyer Duncan Lamont considers the implications of individuals no longer able to hide behind fabricated identities, online, in literature and in the art gallery. Plus, Front Row's resident crime reviewer Jeff Park makes his selection of US and UK thrillers.