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About Audio BPM Detector
The Audio BPM Detector & Musical Key Finder analyzes audio onset transients and spectral flux to calculate exact Beats Per Minute (BPM, 60-200 BPM) and detect harmonic musical keys (Camelot Wheel / Standard Musical Scale) for DJ mixing.
How to Use Audio BPM Detector
Step 1
Upload an audio file (MP3, WAV, FLAC, OGG).
Step 2
Review computed BPM, Musical Key, and Camelot wheel code.
Step 3
Test synchronization with the audio-synced visual beat flash.
Step 4
Click "Copy BPM & Key".
Practical Use Cases for Audio BPM Detector
DJ Track Tagging & Harmonic Mixing (BPM & Camelot Key)
Calculate precise BPM tempos and Camelot musical keys (e.g. 128.0 BPM, 8A / A minor) for seamless beatmatching and DJ sets.
Finding Sample Tempos for DAW Music Production
Detect tempo for un-tagged drum breaks and acoustic guitar loops to align them instantly to your DAW project grid.
Input & Output Examples
Analyzing House Music Track
Audio: `club_track.mp3`
BPM: `126.00 BPM` | Key: `F Minor (4A)` | Time Signature: `4/4` | Confidence: `99.2%`
Key Features & Performance
- ✓Onset detection energy flux algorithm calculating BPM with 0.01 BPM decimal precision.
- ✓Krumhansl-Schmuckler harmonic key detection with Camelot Wheel and Open Key notation.
- ✓Interactive manual Tap Tempo button and metronome synchronization preview.
- ✓100% Client-Side Web Audio API.
- ✓1-Click Copy BPM & Key tags.
Key Terminology & Definitions
Camelot Wheel
A visual numbering system (1A-12A for minor, 1B-12B for major) used by DJs to quickly identify harmonically compatible musical keys.
Onset Spectral Flux
The rate of change in spectral audio energy used to detect rhythmic drum transients and musical downbeats.