A true Jay-Z discography download should cover:

If you want a free (legally grey) but high-quality , go to your local library or used record store. Buy the original CDs from 1998-2005.

Use the "Year" tag accurately so you can watch his lyrical progression from 1996 to the modern day.

Classic albums deserve their iconic covers. Use tools like Mp3tag to embed high-quality JPEG images into the metadata.