How do I create a drive for Music on internal SSD

You asked this question slightly differently elsewhere, and I answered it:

You store music on the internal Music folder either by:

  • copying music folders over the network to the InternalStorage folder, or
  • Dragging and dropping the folders onto the Roon window, and Roon will import them into your library, or
  • If you have a CD drive attached to your NUC, you can rip CDs using it, and Roon will import the ripped files into your library.