I have found my brain is compartmentalizing information. In my How Many Animals can you name in a min. I have kept the same amount for three test or approx. 4 years. This time was different how ever, my brain decided to look at a farm and list the animals you see there and then to Africa and then Australia so forth and so on.
I did not think to much about it until a few nights ago when my Parents were over. They had a smart tablet and I was looking through their library of songs. There I found musicians like Jean Michel Jarre, George Winston, Jean Luc Ponty, Micheal Garrison. I asked them who these artist were and they told me that they are the same artist that I had introduced them to 30 years ago. It would seem that my brain stuck them in the category of instrumental new age genre and sometime the link was broken to the point that I know longer knew the names. The only way to remember them is to go back and listen to their music, that I recognized.