Underground is a room with nobody in it.

It gets sold as a sound, and a sound can be bought

The word is normally sold as a sound. Something rawer, drums with more edge on them, a mix left deliberately unpolished, a certain refusal to be pleasant. It is a coherent aesthetic and there are good records in it.

The trouble is that an aesthetic is purchasable. The drum machine is for sale, the plugin that dirties the top end is for sale, and the photograph of a concrete room with one bare bulb in it costs nothing at all. Anything that can be bought can be worn by work that has none of the properties the word is supposed to certify — which is roughly what happened to it.

The second defence is that underground is a place: the right room, the right postcode, far enough out. That is closer, because it at least points at circumstances rather than at a texture. But it is still wrong, and the recording on this page is the cleanest disproof I have.

A warehouse unit, an afternoon, and nobody in it

It was made at Pirate Studios in Berlin Tempelhof in August 2020 — a self-service DJ studio in a warehouse unit on an industrial estate at the edge of the city. Not a neighbourhood anybody would call fashionable, nothing around it but units and parking. Every visual credential the word implies was present.

The reason for going was plain and slightly bleak. It had been six months since I had last played on a professional sound system, there was nothing in the calendar, and rather than wait for that to change I booked a room by the hour, carried the records in, and played the set anyway. There is a Codex entry about why that gap existed — it is about how dates get traded between promoters and DJs, and what happens to somebody with nothing to trade.

And there was nobody in it. Not a small crowd, not a few friends — nobody. Strip lights on, door shut, the monitors doing all the work in a room built to be soundproof rather than to sound good.

So if underground were the address, this would be the most underground record I own. It has the estate, the unit, the edge of town, the concrete. What it does not have is the thing that actually makes the word mean something, and noticing which half was missing is the point.

What an empty room actually removes

What an empty room removes is not people. It is obligations, and they are worth listing because they are usually invisible.

There is no peak time you have been booked to deliver, so nothing has to arrive at a particular minute. There is no promoter whose night depends on the floor staying full, so no record has to be defensive. There is nobody at the front to keep and nobody at the bar to win back. There is no next DJ to hand a room to in a usable state. Every one of those is a legitimate professional constraint, and in a club they are most of the job.

Take all of them away at once and what is left is only the records you would play if nothing depended on it. That is the actual content of the word. Underground is not a texture and not a postcode — it names how little a set is accountable to, and the sound people recognise as underground is mostly the audible trace of an absent obligation.

Which is also why the term keeps escaping definition. It is not describing the record. It is describing the conditions the record was chosen under — the same structural point the balearic guide makes about selection, and the reverse of the one the Ibiza guide makes about a drop, which is a shape built precisely because a great deal depends on it landing.

And what it costs, which is the half nobody prints

The romantic version of this piece would stop there, and it would be dishonest. Those obligations are not only constraints. They are also the feedback, and losing them costs something real.

A room tells you immediately when a record was wrong. It is the only reliable instrument for that, and it works whether or not you want the information. Without it nothing corrects you. You can hold an idea for eight minutes because you find it interesting, and there is no mechanism anywhere in the room to tell you that it stopped being interesting after three.

So a set played to nobody drifts, and the drift is not a style. Some of what gets released as underground is exactly this — work that was never contradicted, mistaken for work that was uncompromising. The two are indistinguishable from the outside and not at all the same thing.

I would rather be straight about which one this is. It is a document of a condition: an afternoon in a warehouse, six months of no bookings behind it, and the specific sound of a set that owed nothing to anyone in the building because there was nobody in the building. Whether that is a virtue depends entirely on the hour you put it on.

Where this sits in the Hybrid Flight sound

Hybrid Flight works under the claim Emotional Dancefloor Atmosphere, and this recording is the least decorated version of it — no room to read, no arc handed over from anyone, just the selection. The other long-form mixes were made under the opposite conditions, and the difference is audible if you play them back to back.

The recorded work went on later: the Between Coasts EP was written between Andalusia, Ibiza and Berlin, some distance in every sense from a unit in Tempelhof.

The other field guides take the neighbouring questions: a deep house mix for the quiet end of a Berlin night, house music in Berlin, why the same record plays differently at 4am, why house still needs to dream, what balearic actually means and Ibiza before the drop, and what the label European house DJ tells a booker. The two ends of a night have guides of their own — what daylight does to a floor and the blue hour as a technique. The Codex is where the arguments behind all of it get made at length.