Katie Derham presents a host of musical highlights from across the week on In Tune, including the always elegant Anne Sofie von Otter talking about the next steps in her ever-changing career. Two of the stars of the Opera Holland Park documentary reflect on their experiences in "Hip Hop to Opera", plus the visually impaired Chavez twins share their story about confronting obstacles through music. And the Castalian Quartet talk about competitions and King's Lynn.