Expand the library.
We need Dr. Dre's The Chronic. We need Kate Bush's Hounds of Love. We need the Beatles and De La Soul's entire discographies. We know that it involves a lot of complicated legal work, but seeing as to how Adele's 21 and Dr. Dre's 2001—projects that were both previously missing—were eventually added gives us confidence that something can be worked out with other gaps in the library.