Now enjoying the first of Serkin's four Columbia recordings of the Brahms Piano Concerto 2. I usually don't like how orchestral recordings sound in mono, but this one (1945) was recorded quite well. As for the sound in general on this set, I am happy to report that it is excellent! I have only heard the first five discs in full, but they sound great. I also have compared the sound on this set to about 10 prior releases of the same performances from Pearl, Naxos Historical and SONY. In each case, the new set sounds as good as, or better than prior CD releases.