Music Genre Indexes

Explore data-driven insights into music genre popularity and engagement trends across YouTube

How Index Scores Are Calculated

Why bigger videos shape the score — and why the index can sometimes fall

Each genre index is based on a weighted average, where videos with more views contribute more to the score. This highlights the performance of the biggest videos rather than treating all equally.

Step 1: Calculate video weights

weight = video_views ÷ total_genre_views

Step 2: Calculate weighted index

index = Σ(video_metric × weight)

Example (Likes Index): If a genre has 3 videos:

Video A: 1M views, 10K likes → weight = 0.5
Video B: 800K views, 12K likes → weight = 0.4
Video C: 200K views, 2K likes → weight = 0.1

Likes Index = (10K × 0.5) + (12K × 0.4) + (2K × 0.1) = 10,000

For the Views Index, the formula effectively becomes Σ(views × weight) = Σ(v²) ÷ Σ(v).

This means the index reflects both total views and how concentrated those views are in the biggest videos. If one video dominates, the index is high. If views are spread more evenly or new smaller videos are added, the index can fall — even though total views have gone up. A falling trend indicates that more popular videos in an index are growing slower(percentage wise) than the smaller videos.

All Genres Overview

Percentage growth comparison across all music genres

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