The first concert I went to shortly after the Royal Festival Hall opened was given by the London Mozart Players conducted by the late Harry Blech.  Although the acoustics of the Hall have been criticised since, in those days, the music sounded to me to be fresh and clear.  My other abiding memory of the 50's is of the elderly figure of Otto Klemperer wonderfully conducting the Philharmonia through a series of Beethoven concerts and receiving rapturous applause from the audience, all within a few years of the end of the war.  I continue to be a regular concert goer, and look forward to hearing the LMP and the Philharmonia again in the refurbished RFH.