I was reading your post several times. At first I thought that it was Alfred Brendel accompanying. I thought I did not know that Alfred Brendel performs as a pianist in ensemble. I thought that Tim Horton was a cellist and you put cello and piano in the wrong order. I kept returning to the post. Then I google to find out that it is Adrian Brendel - the son of Alfred Brendel and that they play together sometimes.
So this recital is twice as interesting. I am glad that it was a good concert and son is a good musician too.