Signal Comparisons
Key Detection vs Harmonic Complexity
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 separating stable tonal identity from chord-level sophistication.
Release record
SC-03 · Tonal center versus progression richness
March 2026
6 min
Reference comparisons
Core Thesis
The comparison matters because key detection answers where the tonal center lives and how stable it feels. Harmonic complexity answers how rich, surprising, or varied the progression field is once the center is in view.
Where the signals diverge
Key detection answers where the tonal center lives and how stable it feels. Harmonic complexity answers how rich, surprising, or varied the progression field is once the center is in view.
What to read first
Read key detection first when the emotional home of the song feels unclear. Read harmonic complexity first when the song feels plain or over-decorated harmonically.
How to read them together
Together they reveal whether a record is harmonically rich with a clear home, or simply hard to parse at every level.
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.