Plot: Angela Hewitt picks up the Brahms thread from the early evening Prom and launches this Late Night Prom that takes in an unjustly neglected score by Brahms's mentor, Robert Schumann, before observing the composer through the prism of an admirer, Arnold Schoenberg. Andrew Manze, conducting his first Prom as Associate Guest Conductor of the BBC Scottish Symphony Orchestra, sees Brahms as a misunderstood figure, full of warmth