Search demand for chord progressions splits across 24 keys and a half dozen modes. A site that publishes a page for the I-V-vi-IV progression in C major and stops there leaves 23 indexable URLs on the table. The pages that rank cover every key, link cleanly to one another, and ship with audio examples per voicing.

SleekRank reads one row per key from your sheet or JSON file and produces an indexable URL like /progressions/key/d-minor/. The same row drives the headline, the Roman numeral table, the list of common progressions, the related-keys grid, and the OG card. Add a key, and the URL goes live on the next cache refresh.

The list-mapping pattern handles the variable-length lists of progressions and voicings. Store the progressions as a JSON array column in the source, store each chord's voicings as a nested array, and SleekRank renders them all into the base page's progression and voicing blocks. Cross-link by mode, by tonal center, by relative key with three more meta columns.

Music theory search demand is highly long-tail. Players search for chord progressions in E-flat minor at midnight before a session, for the Mixolydian mode at the start of a jazz lesson, for the relative minor of A-flat major during songwriting. A site that covers only the common keys captures a slice of that demand.

A site that covers every key and every mode captures the full surface. The cost of coverage is the gating factor. With hand-built posts, expanding past the seven white-key major scales takes weeks per page because the Roman numeral notation, the voicing diagrams, and the audio samples all need consistent formatting.

SleekRank collapses that cost to one row per key. The template handles the rendering; the data handles the content. The cross-link graph builds itself out of the relative_key and mode columns.

Every page reinforces every other page through the related-keys grid, and the entire site clusters into a tight topical authority signal. That clustering is what music theory queries reward, and it cannot be reproduced at scale through manual publishing.