I was scheduled to perform 3 or 4 songs with an old friend in a small NYC performance space - somewhere I've never been or seen in real life.  There were a lot of people there. I was going to be playing the guitar, and the songs were originals that I had written with my friend. As it got closer to playing time, I could not remember the songs, could not retrieve or piece together the chords, progressions -- it was just outside the grasp of my memory.  The songs could not be performed without my part, so we ended up having to cancel the performance, though I know it was a terrible disappointment to my friend. I realized that I could no longer ignore all the signs and indications that I had previously been ignoring: I definitely had Alzheimer's.