https://abstiro.com/en/ How Abstiro's browser tools work, with notes on code, web APIs, and the details behind them. en Tue, 08 Sep 2026 00:00:00 GMT https://abstiro.com/en/articles/public-domain-chord-progressions/ https://abstiro.com/en/articles/public-domain-chord-progressions/ Tue, 08 Sep 2026 00:00:00 GMT Practice chord progressions built on public-domain tunes. Each link opens the Text Chord Player with the progression already filled in. https://abstiro.com/en/articles/app-state-in-the-url/ https://abstiro.com/en/articles/app-state-in-the-url/ Tue, 08 Sep 2026 00:00:00 GMT How the Abstiro tools make their state shareable and bookmarkable with nothing but the URL — and the encoding and validation gotchas that come with it.