where and how to find blank "music" CD's

Thanks @cleeds @seismicfrog for the information, and I stand corrected. Since computer drives burn perfectly good Redbook discs, I had assumed that a consumer disc burner would simply use the same kind of disc.

I have had three TASCAM CD-RW2000 CD recorders that I used in my live music recording business.  My recollection is that I could write a disc that could be copied an unlimited number of times or a disc that could only be copied once.  How that was accomplished was and still is a mystery to me.  I also believe that the "Music" discs that were available were connected to a scheme to pay artists in a round-about way for the unstoppable copying habits of the digital age !  Having been a professional musician for many years, the idea that your music was assumed to be available to others for free was not an easy concept to understand ---- and I STILL don't understand !

As others have explained, CDR-Audio/Music blanks are designed to work with component CD recorders which were designed to work ONLY with such discs. This was part of a royalty scheme implemented by federal law, the Audio Home Recording Act of 1992. The discs are manufactured with a flag that allows recording by the CD recorder.  The higher expense for the blanks is because of the embedded cost of royalties.  When a consumer copies music using such recorders and discs, there is a statutory presumption of non-infringement of copyright. BTW, CDR-Music blanks will work in any CD writer, while regular CDR blanks will not work in standalone CD recorders. I have a Denon CDR-W1500 that still works great after more than 20 years, although I haven’t used the recording function for years.