{"id":9013,"slug":"apple-chart-surface-review-stress-tests-2026","title":"Review stress tests on the Apple Music chart-surface finding, 41 African markets, 16 August to 3 November 2026","source":"This desk's own Apple Music daily chart collection and its own artist-origin registry, recomputed under restriction","source_url":"","source_type":"computed","method":"Three restrictions were applied to the published measure during review, each recomputed from the same raw Apple Music snapshots. Rows 1 to 3 recompute the confirmed-African slot share on each surface under three market filters: all 41 paired markets, then only the 9 markets this desk's 174-name origin registry actually covers (Nigeria, South Africa, Egypt, Morocco, Algeria, Angola, Ghana, Tunisia, Cameroon), then only the other 32 markets. This tests whether the registry's known geographic bias produces the songs-versus-video gap. Rows 4 and 5 recompute the headline market-breadth counts after dropping markets with fewer than 40 paired country-days, which removes Sao Tome and Principe and Burkina Faso, with the market threshold scaled proportionally from 20 of 41 to 19 of 39. Row 6 records the feed-thinness measurement that prompted a revision: the mean number of chart entries per snapshot on each of Sao Tome and Principe's two Apple charts, read directly from the entry_count column of the collected snapshots.","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 01:57:02","n":6,"first_party":0,"columns":[{"key":"test","label":"Restriction applied","type":"text"},{"key":"markets","label":"Markets in scope","type":"number"},{"key":"paired_days","label":"Paired country-days","type":"number"},{"key":"songs_metric","label":"Songs chart figure","type":"number"},{"key":"video_metric","label":"Video chart figure","type":"number"},{"key":"ratio","label":"Songs-to-video or video-to-songs ratio","type":"number"},{"key":"what_is_measured","label":"What the two figures are","type":"text"}],"rows":[{"test":"Confirmed-African share, all markets","markets":41,"paired_days":2411,"songs_metric":21.86,"video_metric":9.04,"ratio":2.42,"what_is_measured":"Per cent of artist slots matching the 174-name African origin registry"},{"test":"Confirmed-African share, registry-covered markets only","markets":9,"paired_days":531,"songs_metric":23.79,"video_metric":9.49,"ratio":2.51,"what_is_measured":"Per cent of artist slots matching the 174-name African origin registry"},{"test":"Confirmed-African share, the other markets","markets":32,"paired_days":1880,"songs_metric":21.36,"video_metric":8.92,"ratio":2.39,"what_is_measured":"Per cent of artist slots matching the 174-name African origin registry"},{"test":"Market breadth, all markets, threshold 20 of 41","markets":41,"paired_days":2411,"songs_metric":18,"video_metric":213,"ratio":11.83,"what_is_measured":"Artists reaching the market threshold on that surface"},{"test":"Market breadth, markets with 40+ paired days, threshold 19 of 39","markets":39,"paired_days":2375,"songs_metric":21,"video_metric":230,"ratio":10.95,"what_is_measured":"Artists reaching the market threshold on that surface"},{"test":"Feed thinness, Sao Tome and Principe","markets":1,"paired_days":17,"songs_metric":82.6,"video_metric":1.9,"ratio":43.47,"what_is_measured":"Mean chart entries returned per collected snapshot on that surface"}]}