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# Analyzing your music library

djay's automatic beat and tempo detection takes a few seconds to analyze a song when loaded. Once it has detected the BPM and the precise beat locations, it will save the information internally. Therefore, next time the song is loaded the information is available right away.
djay makes it easy to analyze your entire library in the background. This can be a useful tool especially before live performances.
Analyzing your music library (or a specific playlist)

1. Choose Library > Analyze... from the menu
2. Select a playlist
3. Press Start

Learn more about Auto vs. Manual BPM