Classical music on demand?

This may be a dumb question but please humor me.  I am now using a Naim Unitiserve as a source and have ripped hundreds of CDs on its hard disc.  As an alternative, is there a way to play (stream) high quality music on demand without ripping CDs?  I listen mostly to classical music so, for example, could I play or stream a Beethoven or Brahms symphony with a choice of conductors and orchestras on my audio system with audio quality equal to or better than CD without having to download anything—similar to watching an on demand program on television?   What software and hardware would I need?   Presumably the hardware would need a screen or would use an iPad or similar screen to select the music. I may be behind the times on such technology so again sorry if my questions show this.  
You might find this article of interest:

You may also want to check Naxos:

And here:

Most classical streaming I’ve encountered is usually programmed music made available through local radio stations or colleges. If you have a university nearby that also has a radio station, you may want to check with them.

Happy Listening and Good Luck with your search
I enjoy but not high resolution. Still, excellent channels. 
You would have to use a computer or other device to purchase a subscription to a streaming service and download the OS. 
Not sure how the Naim Unitiserve works, but it probably will link to the streaming service. Is this device wireless?

Have you ever tried to sync to an internet music station?