I'm sure this is true for most of us, but my playlists change dramatically over time. However, the icon that represents the playlist always stays the same, it's the covers of the first four albums added, put into a collage, seen here. To further increase the feel that a playlist is growing and changing, it would be cool if this picture, which serves as the "cover" for the playlist also changed to reflect your most recent additions. It could instead be a collage of the covers of the four albums most recently added.
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