Analysis Tool

Key Finder

Select the notes in your melody or chord progression and instantly discover which key it belongs to. Shows matching major and relative minor keys.

Select notes above to find matching keys
Harmonic Matching

Diatonic Scale Analysis

Analyzes inputted note arrays against all 12 major and relative minor key signatures in real-time.

  • ✓ Shows exact key signature matches
  • ✓ Pairs relative major and minor keys
  • ✓ Highlights non-diatonic chromatic notes
Key Signatures
24 Major & Minor
Match Engine
Set Intersection
Required Notes
Minimum 2 Notes
Processing
100% Instant
Songwriting Engine

Harmonic Ambiguity Scoring

Scores progressions that fit multiple keys, helping you identify candidate keys for modulation or modal mixture.

  • ✓ Explains dual-key progressions
  • ✓ Lists chord Roman numerals per key
  • ✓ Ideal for chorus/verse modulation
Modes
Diatonic & Relative
Ambiguity
Probability Weighted
Chords
7 Diatonic Chords
Format
Interactive Table
Visual Interface

Interactive Pitch Selector

Click or tap note buttons to build your melody or chord sequence. Clears instantly for rapid exploration.

  • ✓ Clean chromatic note selector
  • ✓ Zero page refreshes required
  • ✓ Works seamlessly on mobile phones
Notes
12 Chromatic Tones
Input
Touch & Mouse
Clear
One-Tap Reset
Mobile
100% Responsive

How to Find the Key of a Song

Identifying the key of a song is one of the most useful skills for any musician. It lets you transpose songs into a comfortable range, find compatible chords for improvisation, and understand the harmonic structure of the music you love.

To use this tool, click the notes that appear in your melody or chord progression. The tool compares your selection against all major key signatures and shows the best matches. For example, if you select C, G, and Am, the tool will suggest C major (and its relative minor, A minor) since those notes are diatonic to that key.

Understanding the Results

The tool shows all keys whose complete note set contains your selected notes. Each result includes the matching major key and its relative minor. If multiple keys match, your progression is harmonically ambiguous — try adding more notes from your song to narrow it down.

Circle of Fifths Interval Trainer Music Theory Guide

Knowledge Base & FAQs

Key Finder — Frequently Asked Questions

Everything you need to know about our browser-based Web Audio engine, instruments, and music theory workspace.

How does the audio key and tempo finder work?

Upload an audio file or record live sound; Web Audio spectral algorithms analyze chromagram pitch classes to detect key and BPM.

What pitch detection algorithm is used for key identification?

The tool analyzes harmonic energy distributions across Krumhansl-Schmuckler key profiles to determine major/minor tonality.

What audio formats are supported for key detection?

We support MP3, WAV, AAC, FLAC, OGG, and WebM audio files up to 50MB.

How accurate is the online BPM tap tempo finder?

Our beat detection algorithm measures transient energy peaks across sub-bands to estimate tempo within ±1 BPM.

Is uploaded audio sent to external cloud servers?

No, all audio processing occurs 100% locally inside your web browser engine with complete privacy.

What is the Camelot Wheel and how does it help DJs?

The Camelot system numbers keys (e.

g., 8B for C Major), allowing DJs to harmonic-mix tracks in compatible keys.

Can I detect relative minor keys automatically?

Yes, the key finder displays both the primary key and its relative minor/major equivalent.

How long does audio key analysis take?

Browser Web Audio processing completes key and tempo detection in under 3 seconds.

Can I copy detected key and BPM data into my DAW?

Yes, click Copy Results to paste key, scale notes, and BPM straight into your DAW.

Is this audio key finder tool free?

100% free with unlimited audio uploads for DJs, producers, and musicians.