It’s the 150th anniversary of Mahler’s birth, so we investigate a 16-disc box containing his (almost) complete works, along with two other recordings of Mahler symphonies. There’s an impressive new set of Beethoven piano concertos, and there’s more quality keyboard playing in new discs of Schumann and Schubert, who’s also represented by a new Lieder recording. More vocal delights are found in two very different operas recordings and you could do worse than take a step back in time to celebrate the opening of St Paul’s Cathedral, or plunge into the perfumed, modernist sound-world of Olivier Messiaen.