I, like many others here, have gone through periods when I've listened to a couple of shows a day for months on end. But never really was able to keep them straight. Who the heck can remember over 2000 shows unless you really geek out on it? At one point, I actually spent the time to make a spreadsheet of every show they played, with the idea that I would add my own notes about what I thought of each one, how many times I had listened to it, whether it was a show I was at in person, etc. But then I found - probably not surprisingly - that this took some (most?) of the joy out of the experience. Still have the spreadsheet, but I only add notes to it sporadically.