German conductor and composer Otto Klemperer is widely regarded as one of the leading conductors of the 20th century. When he was age 42, Klemperer became of the Kroll Opera in Berlin and was responsible for numerous premieres of the music by modern composers especially Igor Stravinsky, Paul Hindemith and Kurt Weill, and he had brought so many works by Stravinsky to the public. The 4-CD box set includes a musical bonus in the Overture and Dream Pantomime from Hänsel und Gretel composed by Engelbert Humperdinck. The set also concludes with Jon Tolansky’s Sound Biography which illustrates how Otto Klemperer inspired musicians and music lovers not only with his conducting but also with his extraordinary courage, surviving extreme physical and mental adversity with remarkable stoicism. This special disc also includes two never before released items that were discovered as this feature was being prepared: a speech by Dr Klemperer at a reception for his 75th birthday, and a rehearsal during his recording sessions for Mozart’s Don Giovanni. An entire hour of rehearsal can be heard on a bonus CD that appears with EMI Classics’ reissue of the complete opera.