There are three ways to have the biggest lineup, and they disagree

Every season produces an argument about who had the biggest lineup, and the argument never resolves, because "biggest" is three questions wearing one word.

Ask which festival booked the most artists and you get one answer. Ask which booked the most in-demand artists and you get a different one. Ask which had the highest concentration of them and you get a third. All three are computable, none of them is an opinion, and this season they point at three different festivals.

What counts as a headliner here

The word has to be pinned down before any of this means anything.

A headliner, on our boards, is one of the 100 most-booked artists in the index — measured by how many festivals booked them this season. Not the top of the poster. Not the size of the fee. Not who the promoter put in the biggest font.

That definition is deliberately dumb, and the dumbness is the feature. It's a count anyone can check: when we say a festival booked 29 of the 100 most-booked artists, you can go count them. A weighted blend of billing position and fee estimates would be more sophisticated and completely unauditable.

It also means the metric is circular in a specific, honest way. Being booked a lot is what makes you a headliner in this data, so the boards measure demand as expressed by bookers, not acclaim, not ticket sales, not who closed the main stage.

The three answers

Most names on the bill: Tomorrowland Weekend 1, at 398 artists. Weekend 2 follows at 372. Nothing else in the catalog is close — third place is EDC Las Vegas at 255.

Most in-demand artists booked: EDC Las Vegas, with 56 of the top 100. That's the board as we publish it, and Tomorrowland Weekend 1 comes sixth on it with 29.

Highest concentration: Das Energi Festival, where 16 of 41 names are top-100 artists. That's 39.0% of the bill, the densest in the catalog.

Set those side by side and the spread is the whole story:

• Tomorrowland Weekend 1 — 29 of 398 names, 7.3%
• Tomorrowland Weekend 2 — 30 of 372, 8.1%
• Lost Lands — 29 of 208, 13.9%
• EDC Las Vegas — 56 of 255, 22.0%
• Electric Forest — 33 of 126, 26.2%
• EDC Orlando — 43 of 115, 37.4%
• Das Energi — 16 of 41, 39.0%

The median across the board is 18.6%. Tomorrowland Weekend 1 sits at less than half of that while topping the raw-size ranking by 143 names.

This is what our Scene Index brief meant when it said the largest lineup isn't in the top three once you count headline bookings. It's sixth.

Density is a description of the format, not a grade

Nothing here says a 398-name bill is worse than a 41-name bill. It says they are different products, and the number tells you which one you are looking at.

A festival running four days across fifteen stages has to fill roughly six hundred slots. Most of those slots go to artists who are not among the hundred most-booked in the world, because there are only a hundred of those and they cannot be in fifteen places at once. Low density is arithmetic, not a curation failure — and the wide bill is how anyone gets discovered, since a scene where every slot went to a top-100 artist would have no mechanism for producing new ones.

A dense bill is making the opposite trade. At EDC Orlando, 37.4% of the names are top-100 artists, which means a much higher share of any given hour is a name you came for. Fewer discoveries, fewer conflicts, less walking.

Both fill a field. They just sell different days.

What this measurement can't tell you

The density figures above are computed within the 25 festivals that booked the most top-100 artists, because that's the board we publish. A ten-name club-scale bill with three top-100 artists would score 30% and never appear, so read these as the densest among the heavily-booked, not the densest anywhere.

Two more limits worth stating. Lineup sizes are not like-for-like: a three-day multi-stage festival and a one-day single-stage event are counted the same way, and the format explains most of the spread before any curation decision does. And "top 100" is a threshold, so an artist at rank 99 counts exactly as much as one at rank 1 — a bill of borderline names and a bill of the ten biggest in the scene can produce the same count.

None of that makes the number useless. It makes it a number that needs its definition attached, which is true of every honest metric and most dishonest ones.

The Scene Index counts every festival lineup we can get our hands on. If you want a number run against it, say what you're trying to answer: casey@electricstate.app.