Understandably, additional data storage becomes an issue with even incremental micro transactions involving millions of users lifelong history... So maybe the most frequent 100 tracks, chronologically, with options to add to your collection or thumb up from sick a list.. Or, perhaps your last three sessions.. something. I might be driving, nodding off for a nap, making dinner... too busy to think to add a every song we enjoy to our thumbs up list.. This is an excellent idea.
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