Bach rehearsal

I have many reasons to be grateful and this photo shows some in one shot.
1) the man conducting is John Butt. He was a lecturer of mine 20 years ago on a Bach course at uni and was tremendous.
2) now I get the opportunity to sing for him and the piece we’re doing is my favourite: Bach’s Mass in B Minor.
3) I get to perform this for the BBC in a concert at the Barbican on Saturday (being broadcast live on Radio 3).
Lucky lady.