Aha, I have Casals' set of Beethoven's cello sonatas,

they are my most favorites as well. My set includes #1,#2,#3, #4,and #5. The players for the pianoforte are Horszowski, Schulholf, and Cortot, not Serkin, though. Will give it a try.

No, I missed that link, will look it up on youtube, thanks.