Signal Comparisons
Chord Detection vs Key Detection
Methodology only, results not yet published.No accuracy number appears here until it is measured on a labelled set with sample size, baseline and limitations.
A comparison page for readers who need to know why both harmony benchmarks exist.
Release record
SC-07 · Progression detail versus tonal home
March 2026
6 min
Reference comparisons
Core Thesis
The comparison matters because key detection tells you where the song feels centered. Chord detection tells you how the harmonic events unfold moment to moment inside or around that center.
Where the signals diverge
Key detection tells you where the song feels centered. Chord detection tells you how the harmonic events unfold moment to moment inside or around that center.
What to read first
Read key detection first when the song's emotional home is unclear. Read chord detection first when the tonal center is obvious but the progression still feels muddy or bland.
How to read them together
Together they explain whether the song is tonally stable but harmonically plain, or harmonically rich while tonally ambiguous.
Evidence Chain
Related pages and tools.
Use the links below to inspect the benchmark, observatory or tool pages that extend the same claim into practice.