I think the first year that I started watching properly on telly (I'm not hugely knowledgeable about classical music or anything) I had it on in the background and there was a Beethoven choral thing on, and I became totally transfixed by it, just loved it. Can't remember what it was now, but it was fabulous.
There are still tickets for the two main concerts on the Bach day - I am very very tempted to go for it. It would mean staying overnight as the last train home is at 8.55, but I am sorely tempted! And the Brandenburg concertos are earlier in the day, I could queue for the cheap tickets. OH it's tempting! But my car tax is also due, and I need to get by brake discs done... Oh dear.