''It seems to me that Mahler has the whole history of music in his care,'' wrote Luciano Berio in 1978, ten years after composing his Sinfonia. Joseph Pons leads the BBC Symphony Orchestra and Synergy Vocals in this supreme masterpiece, whose third movement is a monument to the glory of the emblematic post-Romantic composer. A few years later, Berio went on to orchestrate a number of songs based on texts from Des Knaben Wunderhorn (which Mahler originally scored for piano and voice), creating a symphonic backdrop tailor-made for a great baritone voice like that of Matthias Goerne.