[crazygringo]

To paraphrase what advertisers say...

"I know I don't listen to half my music. The problem is, I don't know which half."

The last thing I want to do is shuffle albums/tracks between lists that keep track of which items I listen to, and which ones I don't. And it changes over time, too. That would probably be several days' worth of work. Far, far, far cheaper just to buy a larger device.