Apple denying me access to music on my Mac that I copied from albums that I own.

You can buy an app from iTunes that allows you to save your music on their cloud and play it back through iTunes along with your apple-purchased music. It is very inexpensive but it is a yearly fee.

Your question doesn't completely make sense -- Apple did do this, but they stopped quite a long time ago. It's been the subject of several lawsuits, including a still-pending anti-trust suit. I have mp3 copied from CD's on my own mac, and iTunes is playing them just fine. If Apple was doing it, then yes it would be a problem.

I think you're saying you copied into the iTunes software -- which you've licensed from Apple -- that you've uploaded onto your computer certain files that code for songs that you didn't license from Apple [no one "buys" song files, they're only licensed]. Through its software, Apple is apparently not permitting you to play those unlicensed files. Seems right to me. Your own attorney should review the iTunes License Agreement to verify that Apple has the right to prevent you from accessing those files but, as a legal principle, there's no reason why that would be improper. IF, however, you copied those song files into some other music listening software and through the operating system of your Apple Macintosh computer Apple is preventing you from listening to those songs then that's a different matter. My initial reaction is that would NOT be proper. Speak with your own intellectual property attorney. Good luck.