It has been pointed out to me by the Mad Scene at Opera Australian that today is precisely 100 years of Strauss' Der Rosenkavalier. Find a little Rosenkavalier to hear before the day is over.
You could start here.
Footnote. All my life I've known people who complain about her diction, so let's make something clear. If you speak the language, you can understand every word.
And you simply must watch this.