🎼 Key Signature Identifier
Select notes or accidentals from your sheet music to identify the most likely key signature and scale!
🎵 Select Notes
Click the notes you see in your music:
♯ Key Signature Accidentals
If you know the key signature, select the sharps or flats:
The Key Signature Identifier is an interactive music theory tool that helps users determine key signatures by selecting notes from their sheet music or choosing accidentals (sharps and flats) from the key signature itself. The tool uses intelligent analysis to match input against a comprehensive database of major and minor keys, providing confidence scores and displaying both the most likely key and possible alternatives with scale notes, accidentals, and common chord progressions. Perfect for music students analyzing unfamiliar pieces, teachers demonstrating key relationships, or composers exploring harmonic possibilities, the tool includes educational features like music theory tips, relative key explanations, and circle of fifths relationships to enhance learning while providing practical key identification assistance.