I often listen to classical using the free streaming internet radio on iTunes (I'm a Mac user, but I believe there's still a version of iTunes for Windows users as well).
I recently found a station in the classical area that plays instrumental music from movie soundtracks, much of which is in a classical vein.
It can be accessed via a web browser as well, or on Android or iOS:
https://www.cinemix.us/#Then click:
Listen --> Normal quality