Methodology
Daegon Charts uses a consistent editorial framework to turn music-performance information into weekly rankings. The exact source mix can vary by chart and period, because the music industry itself has changed: physical sales dominated some eras, downloads mattered greatly in others, and streaming became increasingly important later. The objective is therefore consistency of interpretation rather than pretending that every year can be measured with the same raw inputs.
Weekly continuity
Each chart week is treated as part of one continuous history. Entries retain their prior peak, accumulated weeks and weeks at number one when they continue from an earlier week. A title is considered a new entry only when it has not appeared previously in that chart history; a returning title can be identified as a re-entry instead of being reset as new.
Last-week position is derived from the immediately preceding chart week when continuity exists. Drop-outs are likewise determined by comparing the current chart with the previous week.
Songs
The main songs ranking is designed to reflect broad music consumption and impact. Depending on the period, the evidence can include sales, streaming, radio exposure and market performance. Modern weekly data can use more direct consumption measures, while reconstructed historical periods rely more heavily on documented market performance and era-appropriate evidence.
Movement indicators distinguish new entries, re-entries, rises, falls and stable positions. Large movements are displayed separately from smaller changes so readers can understand the shape of a chart week at a glance.
Albums
Album performance is evaluated as album performance rather than simply inheriting the popularity of the artist's current singles. Release weeks are especially important: major releases commonly concentrate substantial demand immediately, so the historical model avoids systematically forcing large albums to debut low and climb unrealistically over many weeks.
Where sales and streaming information are available, they are interpreted as separate signals before being combined into an album-level view. Catalog strength can matter, but unrelated success by the same artist is not automatically transferred to an older album.
Artists and credits
The artist chart aggregates broader artist performance while maintaining normalized identities across the archive. Alternate spellings, punctuation variants and aliases are reviewed so the same act is not accidentally divided into multiple chart identities. The primary artist field is normalized to the principal credited artist used by the project; secondary featured artists do not automatically create separate primary credits.
Historical reconstruction
Historical charts are reconstructions, not claims that a modern metric existed decades ago. The project examines evidence appropriate to each period and market, then applies the same continuity rules used elsewhere in the archive. Historical reconstruction may consider performance in multiple relevant territories, release context, longevity and documented public impact.
Because source quality differs across eras, reconstructed history can be revised when stronger evidence is found. Corrections are intended to improve consistency, remove duplicates and repair broken chart runs rather than to rewrite results casually.
Transparency
Daegon Charts does not claim affiliation with any commercial chart provider. The rankings and historical reconstructions are editorial outputs of this project. External services may provide factual metadata or artwork, but the organization, historical continuity and ranking framework presented here are maintained independently.