Diversified list
When recommendations start narrowing someone's taste over time, surface a few that fall outside the established pattern to keep discovery alive.
Relevant principles
What the research says
Users prefer some diversity (satisfaction peaks at a middle level, not maximum), and perceived diversity lifts satisfaction, usefulness and confidence, though via satisfaction constructs, not a pure trust scale. 1
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Interactive demo
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4 genres
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Big Thief · Folk
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4 genres in the next four. Little Simz is the one I kept room for: nothing you have played points there.