Converting music files on mac to MP3 format?

I have a bit of a tricky situation. I have bought legitimate cds some of which I uploaded on my mac some years ago when we sstill had CD readers. Since I am now subscribing to apple music, it appears that not all the music I originally had on my computer is available in my private library. Could be I am mistaken, but for one cd in particular, I am pretty sure I had uploaded on my mac. Now it seems I only have 3 tracks of that cd available in my library. And the track I want is no longer there which means I am redirected to apple music.

In any case, what I want, is to be able to convert some pieces to mp3 because I want to use a program (vocalremover found on the web) that allows me to remove the voice from the tracks so I can use the track as a karaoke to practice my singing. Someone told me to get the song from youtube and use ytmp3.cc software but I am weary of this after reading comments posted here. Any suggestions would be appreciated.