Data I would love to have: albums sold to used music stores. Even if it was just a few charter stores as sample data. What I want to have is a sort of “staying power” index; a list that ranks albums by how many people still own them, not by how many were originally sold. I am never amazed at how many new albums are in the used bins, because they all contain 1 popular song and 11 other crocks of shit. I want to see what the albums are no one would ever part with. You could use the actual sales data to make a ratio vs. how many were sold back. Anyone run a used record store?