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- Sort your collection by key, select all tracks with no key, right click, select "Analyze Key"
- Go to Preferences > Analysis Tab:

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Last week I added a shed load of new music to my Rekordbox library.
All the BPMs have been analysed and are displaying - however, none of these tracks have been assigned a key. All other tracks previously added are displaying a key ok.
Any idea why this is? Does it take a while to appear or do I need to tell the system to look for this info?

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Thanks to the OP for asking this!! I was wondering the same thing about the key info. Read the post, saw the setting. Curious, why isn't this kicked on by default?
At any rate.. thanks for the answer! Helps my mixes tremendously.