{"id":9008,"slug":"apple-chart-surface-depth-sensitivity-2026","title":"Depth sensitivity: Apple Music songs versus music-videos chart asymmetry recomputed at four chart cut-offs, 41 African markets, 16 August to 3 November 2026","source":"This desk's own Apple Music daily chart collection (afw_chart_snapshot \/ afw_chart_entry)","source_url":"","source_type":"computed","method":"The overlap and market-breadth measures were recomputed four times on the identical 2,411 paired country-days across 41 African markets, truncating both charts to the same chart position cut-off each time: full chart, top 50, top 25, top 10. Truncation is applied symmetrically to both the songs chart and the music-videos chart before lead artists are extracted and de-duplicated, so any difference that survives cannot be an artefact of one chart being deeper than the other. video_only_pct is the share of per-country-day de-duplicated video-chart lead artists not present on the same market's songs chart on the same date. artists_20plus_video and artists_20plus_songs count normalised lead artists reaching 20 or more of the 41 markets on that surface at that cut-off. The full-chart row is the same computation as the headline overlap table.","unit":"count","license":"Afrobeats Wire's compilation and analysis are licensed CC BY 4.0. Rights in the underlying source data remain with the source named above.","confidence":"high","retrieved":"2026-11-04 01:48:24","n":4,"first_party":0,"columns":[{"key":"cutoff","label":"Chart positions included","type":"text"},{"key":"paired_country_days","label":"Paired country-days","type":"number"},{"key":"video_artist_slots","label":"Video-chart artist slots","type":"number"},{"key":"songs_artist_slots","label":"Songs-chart artist slots","type":"number"},{"key":"on_both_slots","label":"On both charts","type":"number"},{"key":"video_only_pct","label":"Video-only share of video chart (%)","type":"number"},{"key":"artists_20plus_video","label":"Artists in 20+ markets, video","type":"number"},{"key":"artists_20plus_songs","label":"Artists in 20+ markets, songs","type":"number"},{"key":"breadth_ratio","label":"Video-to-songs ratio of 20+ market artists","type":"number"}],"rows":[{"cutoff":"Full chart","paired_country_days":2411,"video_artist_slots":148635,"songs_artist_slots":114111,"on_both_slots":20743,"video_only_pct":86.04,"artists_20plus_video":213,"artists_20plus_songs":18,"breadth_ratio":11.83},{"cutoff":"Top 50","paired_country_days":2411,"video_artist_slots":78686,"songs_artist_slots":63174,"on_both_slots":8678,"video_only_pct":88.97,"artists_20plus_video":110,"artists_20plus_songs":14,"breadth_ratio":7.86},{"cutoff":"Top 25","paired_country_days":2411,"video_artist_slots":40854,"songs_artist_slots":34627,"on_both_slots":3613,"video_only_pct":91.16,"artists_20plus_video":62,"artists_20plus_songs":8,"breadth_ratio":7.75},{"cutoff":"Top 10","paired_country_days":2411,"video_artist_slots":17047,"songs_artist_slots":15982,"on_both_slots":1084,"video_only_pct":93.64,"artists_20plus_video":22,"artists_20plus_songs":1,"breadth_ratio":22}]}