Although Klemperer had primarily been contracted to provide orchestral music for the Warner Classics catalogue there were soloists who benefited from his presence in recording concertos. Karajan had made a most successful recording of the Mozart Horn Concertos with the then lead player in the Philharmonia Orchestra, Dennis Brain, Klemperer recorded them with his lead player Alan Civil in 1960.

His superb series of orchestral works by Beethoven were enhanced by recording the Piano Concertos and Choral Fantasy with the star who had recently recorded the Piano Sonatas, Daniel Barenboim and the set was issued two years before the composer’s bicentenary in 1970. Both had their distinctive views on the works: Klemperer’s vivid but essentially monumental approach was questioned and provoked by the much younger man – just as the composer writes music which the piano and the orchestra “discuss” in different ways which is the very essence of a concerto. He also recorded Mozart Piano Concerto No. 25 with him in 1967.

The Violin Concertos by Beethoven and Brahms were recorded with Yehudi Menuhin in 1966 and David Oistrakh in 1960 respectively. A further disc of Piano Concertos of Liszt No. 1 and Schumann was made with Annie Fischer in 1960-2.