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Key-matching two songs (Harmonic Mixing)

djay's sophisticated on-the-fly audio analysis allows you to easily find songs in the same key for a transition in perfect harmony. Even if keys don't match djay allows you to shift the pitch of songs for transposition to an arbitrary key.
Browsing songs by key using the the circle of fifths
Select a key to get all corresponding songs.
Note: you can arrange and sort keys by closest pitch distance (instead of circle of fifths) in Preferences - General - Key.
Matching the pitch of songs that are not in the same key
Even if songs are not in the same key you can use the pitch controls to match their keys.
djay makes it easy to analyze your entire library in the background. This can be a useful tool especially before live performances.
Learn more about analyzing your library