Szell's performance is again of quite a different order, one of the very finest ever put on disc, white hot even beyond Bernstein's. The late John Culshaw, producer at the sessions in Walthamstow Assembly Hall in 1962, used to enjoy telling the story of winding up an already angry George Szell. That inspired tyrant of a conductor was furious at the start of the session to find that many players were not the same as those who had just given the concert performance with him. When he came back to listen to the first playback Culshaw deliberately kept the controls rather low, making the result seem dull. That prompted Szell, back on the podium, to unleash a force in the subsequent takes that has to be heard to be believed.

The Grosses Festpielhaus in Salzburg has been the scene of countless memorable musical events - operas, concerts and recitals - for 50 years. Here is a unique chance to celebrate the glories of this distinguished era. In an exceptional collaboration with the Salzburg Festival, we have prepared a 25-CD box set - 5 complete operas, 10 concerts and 2 recitals - featuring many of the world's greatest artists, in recordings with classical status and others that are appearing on CD for the first time.

It is good to have this uninhibitedly tuneful setting of the mass back in the catalogue, particularly in this warm and energetic Parisian performance. Gounod here in almost every section presents melodies that to us today have a hint of hit tunes, particularly the brash theme that underpins the "Credo" (which later returns Cut La forza) and the deliciously inappropriate tune for "Agnus Dei". The fact that vulgarity is only just avoided somehow adds to the attractions, and certainly no Gilbert and Sullivan enthusiast should miss hearing the work. The performance is even more enjoyable than I had remembered with excellent work from the soloists as well as the choir.

In 1964 Deutsche Oper Berlin still had no General Music Director. But Artistic Director Gustav Rudolf Sellner made a virtue out a necessity and – in addition to the permanent conductor Heinrich Hollreiser and the regular guest conductor Karl Böhm – brought in further conductors from home and abroad for individual productions. For “Don Carlos” he invited Wolfgang Sawallisch, who since 1957 had been making a name for himself at the Bayreuth Festival, above all with “Tannhäuser” and the “Flying Dutchman” and since 1960 had been acting General Music Director in Hamburg. He had at his disposal an ensemble of outstanding soloists. In addition to Josef Greindl and Dietrich Fischer-Dieskau, they included James King in the title role, Pilar Lorengar, Martti Talvela, Patricia Johnson and Lisa Otto as the Voice from Heaven.

The opening of the Deutsche Oper Berlin on 24 September 1961 is always seen in the context of partition of Germany, cemented six weeks earlier, and the construction of the Berlin Wall. The coincidence of the two events did not go unnoticed in the many press reports at the time, with most citing remarks about the city’s circumstances by the then Governing Mayor of Berlin, Willy Brandt: “Having experienced more in the last few weeks than in an entire generation, a city divided by a wall of coercion and shame is once again making music, producing theatre, staging fine international exhibitions and can at last open the doors of its long-awaited new opera house.” For almost twenty years – since the destruction of the former “Deutsches Opernhaus” in November 1943 – Berlin had had to make do with a makeshift stage. Although already in the early stages of a terminal illness, Ferenc Fricsay conducted the inaugural performance.