# Orchestra demos

> This origin serves in-browser demonstrations of Orchestra, and nothing else. Only Harmonica, the music library, has one: it runs the repository's real queue algorithm in the visitor's own browser over YouTube links they paste. Accordion has no browser demo, because its aligner is a native recogniser rather than anything a browser can run. Ensemble and Conductor are not demonstrated here at all. This is not a self-hosted install and nothing here is the product. The product, and the summary of it, are at https://orchestra.org.uk and https://orchestra.org.uk/llms.txt.

This file is the agent-readable summary of https://demo.orchestra.org.uk, which is a separate origin from the main site with a separate deployment. To be more token-efficient: read this instead of parsing the HTML.

## What the demo does

- The visitor pastes YouTube links. The page reads each video's title and uploader through YouTube's oEmbed endpoint.
- The queue is generated by the repository's own `algorithm.py`, `history.py` and `ratings.py`, run in the browser through Pyodide in a web worker. It is the real algorithm rather than a reimplementation of it.
- An Algorithm panel exposes the real controls as sliders and switches: cooldown weighting, satiation, rediscovery, skip penalty, rating boost and clustering.
- Playback goes through YouTube's official embedded player, behind a consent gate that has to be accepted first.

## What it does with data

- Everything the visitor builds, being the links, the ratings and the listening history, stays in their own browser storage. None of it reaches a server of ours.
- A prompt asks how long to keep that storage, and honours the answer.
- Two external hosts are contacted: jsDelivr for the Pyodide runtime, and YouTube for oEmbed lookups and for playback once consent is given. The main site does not contact either.

## What it is not

- Not an install. There is no daemon here, no library, no profile and no API.
- Not a demonstration of Accordion, Ensemble or Conductor. The front door says so rather than showing a fake.

## Links

- This origin: https://demo.orchestra.org.uk
- The Harmonica demo itself: https://demo.orchestra.org.uk/harmonica
- The product: https://orchestra.org.uk
- The product's summary, which is the one to read for what Orchestra is: https://orchestra.org.uk/llms.txt
- The algorithm in depth: https://orchestra.org.uk/harmonica/algorithm
- Source: https://github.com/alexgeevs/Orchestra