The question of what music I've listened to, how often and when can now be answered easily, thanks to the fact that my music player, Giocoso, stores details of its most recent plays every time it finishes playing something. Each composer mentioned can be clicked to take you to the biography and music plays page for that specific composer. Similarly, each composition name can be clicked, though the link is to the generic composition name, not the performer-specific version. In other words, Solti's Meistersingers link will take you to the same page as Knappertsbusch's.
This page updates every 15 minutes, at 5, 20, 35 and 50 minutes past the hour.