My two favorite Strauss operas are the dark sinister pieces - Salome and Elektra, and his Four Last Songs - but even in his lighter moments, such as the comedy Rosenkavalier, there's always something a little unsettling in the music, something that touches you in just that way. And music ought to be like that.
This vintage clip is from the 1960 movie, with Sena Jurinac, Anneliese Rothernberger, and the magnificent Elisabeth Schwarzkopf. Herbert von Karajan conducts the Vienna Philharmonic. ◙