Terms of Use
The terms that apply when you use a Plectrum app or this website.
Last updated 29 July 2026
These terms apply to Plectrum Practice, Plectrum Theory, any later Plectrum app including Plectrum Exercises, and to this website. The apps are made by Method Missing LLC. By installing or using an app you agree to these terms.
Your licence
Buying an app gives you a personal, non-exclusive, non-transferable licence to use it on devices you own or control, in line with Apple's Licensed Application End User License Agreement. Where these terms and Apple's agreement differ, Apple's agreement governs your use of the app itself.
You may not copy, redistribute, sell, rent, reverse engineer or attempt to extract the source code or bundled content of the apps, except where the law expressly permits it.
Content and intellectual property
The apps, this website, the Plectrum name and logo, the lesson content in Plectrum Theory, and the audio, artwork and interface designs are owned by Method Missing LLC and protected by copyright, except where stated otherwise. Musical facts and theory are not owned by anyone. The particular way they are explained, drawn and arranged in these apps is.
The Plectrum Theory app icon incorporates artwork from Twemoji, used under CC BY 4.0.
Purchases and refunds
All purchases are made through the App Store and handled by Apple. Prices are set on the App Store and may change. Refunds are governed by Apple's policies and are requested from Apple, not from me. I cannot issue a refund for an App Store purchase.
Educational content
Plectrum Theory is an educational reference. It is written carefully and checked, but music theory has conventions that vary by tradition, by teacher and by context, and the apps are not a substitute for a teacher. Nothing in them is professional advice of any kind.
Hearing safety
Plectrum Practice produces continuous audio. Prolonged listening at high volume can damage your hearing. Set a comfortable level, particularly when using headphones, and take breaks.
No warranty
The apps and this website are provided "as is" and "as available", without warranty of any kind, express or implied, including any warranty of merchantability, fitness for a particular purpose or non-infringement. I do not warrant that the apps will be uninterrupted or error free, or that any defect will be corrected.
Limitation of liability
To the fullest extent permitted by law, Method Missing LLC is not liable for any indirect, incidental, special, consequential or punitive damages, or for any loss of data, arising out of your use of or inability to use the apps or this website. Total liability for any claim will not exceed the amount you paid for the app in question.
Some jurisdictions do not allow the exclusion of certain warranties or limitations of liability, so parts of the two sections above may not apply to you. Nothing here limits any right you have that cannot be limited by law, including your statutory consumer rights.
Changes
These terms may be updated as the apps change. The effective date at the top of this page reflects the current version. Continuing to use an app after an update means you accept the revised terms.
Governing law
These terms are governed by the laws of the State of New York, United States, without regard to conflict of law rules, and without limiting any mandatory consumer protection you have where you live.
Contact
Questions about these terms can go to support@plectrum.app.
Effective 29 July 2026.