A utility like CDex will copy CDs to disk, but iTunes can be used too. In other words, put it on the computer in a digital audio file format like WAV, MP3, M4A, OGG and so on. What do you do with your vast music CD collection though? If you have a computer with a CD player it is possible to copy the music from the disc to the disk. Of course there will always be niche markets in music and some people still swear by vinyl LPs as the best way to listen to music, but for most of us, streaming is best.
Physically buying music does not make a lot of sense to many people. CD sales are still popular, but for the price of one CD a month you could stream all the music you want with a choice of millions of tracks. The future of music is streaming and people are buying music less and less.
Use it to create your own music streaming service. Microsoft may have ditched its streaming music ambitions, but the Groove Music app continues to receive updates and is better than ever.