Compangon — Terms of Use
Last updated: 2026-09-26 · governs the public beta · plain-language, EU-facing.
By downloading or using Compangon you agree to these terms with Compangon UG (haftungsbeschränkt), Berlin (see the Imprint).
1. Beta software
Compangon is in public beta. It is early software: it may change, it may contain bugs, it may be unavailable at times, and we may stop offering it. Keep your own backups of work that matters. Nothing in these terms affects your statutory rights as a consumer.
2. Your own model — a key you bring, or a model on your computer
Compangon works with an AI model key you provide (bring your own key), or with a model you run on your own computer. When you use a provider (e.g. OpenAI, Anthropic), that use is governed by the provider's own terms, and you pay the provider directly for usage; its prices, availability and changes are its own. A model on your own computer needs no key, sends nothing to a provider, and comes with its own licence, which applies to your use of it. Compangon never charges for model usage.
3. Your music is yours
Anything you create with Compangon is yours. We claim no rights over it, take no licence in it, and place no restrictions on what you do with it. The one exception is a composition report you choose to send: we keep it for up to 90 days, and use it only to find and fix problems with how Compangon composes. We don't use your work — or anything you write in Compangon — to train models (see the Privacy note — we never collect it on our own; when you compose, it reaches the AI provider you connected, under your own key).
4. AI-assisted output
Suggestions come from a language model: they can be imperfect, unmusical, or resemble existing music. Compangon is a copilot — you review and decide what to keep, and we'd urge you to look over anything before you publish it, perform it or pass it on, including for resemblance to music that already exists. Whether AI-assisted music is protected by copyright is not settled the same way everywhere.
Copyright, and how you work with Compangon. Copyright protects what a person creates. That's why the way you work matters:
- Compangon as your assistant. You work with Compangon as your copilot: you bring your own music into it — your score, your ideas — and it makes suggestions; you keep what serves the piece, change it, rework it and build it into what you're writing. What you shape this way can be your own creative work — and that part is what copyright can protect. Picking one of its suggestions isn't enough on its own — what counts is what you make of it.
- Handing Compangon full control. If you only describe what you want and keep what comes back as it is, there is little of you in it — and in many countries music like that may not be protected by copyright at all, however detailed your request was.
How much of the result is yours depends on what you do with its suggestions, not on the tool. The rules differ from country to country and are still developing, so this is general information, not legal advice. Either way, we claim no rights in what you make (§3).
When Compangon writes generated music into your score, it also adds one line to the score file's properties saying the score contains AI-generated material, as EU law requires. The line is stored in the file and travels with it when you save, export or share it.
5. Price
Compangon is free during the public beta, and during the beta we don't charge for model usage either — that's between you and your provider (BYOK). If we introduce paid plans later, we'll tell you first and additional terms will apply.
If you switch on something that shares more with us than the anonymous install count — usage analytics, profile details, or composition reports — the law treats that as your side of a bargain, and you then have 14 days to withdraw from it. That right ends as soon as you start using Compangon, which for most people is the same day. You can switch any of it back off whenever you like, in Settings, and the rest of these terms are unaffected.
6. Accounts
An account is optional — Compangon works without one. If you create one, keep your sign-in details to yourself and give us details we can actually reach you at. If you think someone else has got into your account, tell us and we'll help you shut it. You answer for what happens under your account where it was down to you; we won't hold you to something you had no way of preventing.
7. Fair use
Don't use Compangon for anything unlawful, or to infringe other people's rights. Don't try to break it, overload it, or work around the limits it sets — and don't sell access to it or pass it off as your own product.
8. Our intellectual property
Compangon, its name and its branding are ours, and using the app doesn't transfer any of that to you. Compangon is protected by copyright: you get a personal licence to run it, which you can't pass on to someone else. If you use Compangon in a way §7 or this section rules out, we may end that licence — we'll tell you why.
Compangon also includes open-source components that are not ours. They stay under their own licences, and those licences give you rights this section does not take away. The full list is shown when you install Compangon, on the licence page you accept, and a copy is saved with the app, in its folder, as THIRD-PARTY-NOTICES.txt.
What you may not do with the app itself. You may not copy Compangon beyond what installing it, running it and keeping a back-up copy need; copying it beyond what this licence or the law allows infringes the copyright in it. You may not pass it on, sell it, or make it part of something you sell. You may not take the name, the logos or the notices off it. You may decompile or disassemble it only as far as § 69e UrhG allows — that is, only to obtain, yourself or through someone acting for you, information needed to make an independently created program work with other programs, when that information isn't already readily available to you, and only for the parts needed for that; what you learn that way may be used only for that purpose, passed on only as far as that purpose needs, and never used to build or sell a program whose code is substantially similar to Compangon's, or for anything else that infringes the copyright in it. You may not unpack the files it installs to take out the prompts, the musical data or the trained tables inside them, or use anything taken out of those files to build or publish something of your own. And if we ever add a technical protection to the app, you may not work around it.
The law gives you three rights, and nothing in these terms takes them away. You may keep a back-up copy of Compangon where you need one to go on using it (§ 69d(2) UrhG). You may watch, study and test how Compangon works while you load, display, run, transmit or store it as you're entitled to, to find the ideas and principles behind any part of it (§ 69d(3) UrhG). And you may decompile it in the case described above (§ 69e UrhG). Nothing in this section limits any of them.
9. Disclaimers & liability
We are liable to you under the law, and these terms do not change that. We exclude no liability and limit none, and nothing here affects your statutory rights.
Two points describe how Compangon works; neither limits what we owe you. Compangon is a copilot: it proposes, and you review and decide what goes into your score — so check what it writes before you publish, perform or share it (§4). And it is early software running on your own computer alongside other programs — so keep your own backups of work that matters (§1).
10. Changes to these terms
We will change these terms from time to time — because the product changes, or the law does. New terms apply from the day we post them, and the date at the top says when that was. If a change meaningfully affects what you get or what you agree to, we'll say so in the app before it takes effect, not only on the website.
You are never stuck with a version you don't want: stop using Compangon, or delete your account; during the beta nothing is owed either way. Your music stays yours whatever these terms say (§3).
11. Contact
Questions, notices or complaints: [email protected] (see the Imprint).
Your statutory consumer rights — including for defects — are not affected by these terms. There is no minimum term: Compangon is free during the beta, and you end it by simply not using it any more; an account can be deleted in Settings.
12. Which law applies, and where a dispute is heard
German law applies to these terms. Because you are a consumer, that does not take anything away from you: whatever these terms say, you keep every protection the law of the country you live in gives you and that cannot be signed away.
If it ever comes to court, you can bring a claim either where you live or where we are. We can bring a claim against you only where you live. These terms name no court of their own — that is not ours to choose for you.
13. Other companies' products
Compangon connects to music software made by other companies — today that is MuseScore Studio. Those apps are separate products with their own terms, and their names belong to their owners. MuseScore is a trademark of MuseScore BVBA, part of Muse Group. Compangon is an independent product and is not affiliated with, endorsed by, or sponsored by Muse Group; we name MuseScore only to say what Compangon works with.