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New: Music Theory Fundamentals guide covering: - Sound and pitch (frequency ranges, logarithmic perception) - Why twelve notes (harmonic series, Pythagorean comma) - Intervals as atoms of music (size, quality, perfect vs major/minor) - Keys and key signatures (sharp/flat key tables, FCGDAEB mnemonic) - Functional harmony (tonic/subdominant/dominant, T-S-D-T) - The dominant seventh (leading tone, tritone resolution) - Rhythm and meter (4/4, 3/4, 6/8, odd meters) - Physics of consonance (waveform alignment, cultural context) Enriched existing pages: - Tones: overtone series table, enharmonic equivalents and spelling rules - Scales: 12-bar blues, parallel major/minor, borrowed chords, more progression examples with song references - Chords: inversions (root/1st/2nd/3rd), extended chords (9ths/11ths/13ths) Also: add Gauges analytics tracking to all pages Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>