The CDJ-900 turntable includes rekordbox, Pioneer's proprietary music management software that organizes and catalogs a DJ's entire music library. When music files are imported to rekordbox, the software analyzes each file and prepares them for use specifically with the new CDJ turntable. Key elements of Pioneer's rekordbox software: Analyze Beats Per Minute (BPM) Data – BPM / Tempo information for each song is identified and processed into rekordbox for use by the DJ in preparing