Tempo, Key & Chord Reference
Interactive Circle of Fifths, piano keyboard with scale highlighting, diatonic chord grid, and full tempo subdivision table.
Scaler 2 Lite — chord detection and suggestion. Works as plugin inside DAW.
Scaler 2 — full version. Detects key from audio, generates progressions and MIDI
Synchro Arts Revoice Pro — pitch correction with key-aware harmonization
About the Tempo, Key & Chord Reference
The Tempo, Key & Chord Reference is a free interactive tool for music producers who want accurate answers fast. Whether you're searching for circle of fifths interactive tool, diatonic chord grid by key, BPM subdivision table, this tool gives you real-time results without leaving your browser — and explains the reasoning behind every value so you know what to do with it.
Every tool on MusicProductionWiki is built around one principle: answer the question and explain the reasoning. The Tempo, Key & Chord Reference not only calculates — it shows you why those values work, what changes when you adjust them, and what professional producers do differently across genres.
This tool is part of the Arrangement & Structure category. It's embedded directly inside the relevant entries in The Producer's Bible — MPW's comprehensive reference library — where it appears in context alongside the theory that explains why each setting works the way it does.
All tools on MusicProductionWiki are free, require no login, and work in any modern browser on desktop or mobile.
Frequently Asked Questions
How do I use the Circle of Fifths to find chords?
Select your key on the Circle of Fifths. The 7 diatonic chords of that key are the ones built from its scale degrees. Adjacent keys on the circle share 6 of 7 notes, so they borrow chords easily. Moving to a key two steps clockwise adds a sharp — two steps counterclockwise adds a flat, creating a darker mood shift.
What BPM subdivisions are most useful for delay and LFO?
The most musical delay and LFO subdivisions are: dotted eighth (0.75 beats — the classic U2 delay), quarter note (1 beat — standard sync), sixteenth note (0.25 beats — tight rhythmic effects), and triplet eighth (0.667 beats — for swing and groove). This tool calculates all values in ms for any BPM.
What is a diatonic chord?
A diatonic chord is built entirely from the notes of a scale without any accidentals. In C major, all seven diatonic chords use only the white keys. Diatonic chords are the harmonic foundation of a key — they always work together because they share scale notes. Non-diatonic chords borrow from other keys and create tension or color.