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Open Opus is a free, open database for classical music metadata. It was created as a backend for the players Concertmaster and Concertino. But it can be used in any classical music application. The data is completely open for anyone not only to use but to edit as well - it's a wiki-style free-to-edit database.

Concertmaster and Concertino are open source classical music front-ends for Spotify and Apple Music, respectively. They consume Open Opus data and combine it with automated analysis of the Spotify/Apple Music own metadata in order to create an adequate user experience for classical music.

Team and History

All Open Opus projects were created by Adriano Brandão, classical music aficionado and web developer from São Paulo, Brazil. It all started with Concertmaster, created in 2014 as a front-end for Deezer and Rdio. In 2016 it changed its focus to Spotify. Since Spotify hadn't a web SDK at the time and Concertmaster explored a non-documented workaround, it was a desktop app. It became a web app in 2018, when Concertmaster adopted the then-new Spotify official web SDK.

In 2019, everything changed: Concertmaster was completely rewritten; its database was split from the player and renamed Open Opus; it was forked into Concertino, a front-end for Apple Music; and all three projects went open source under the Open Opus umbrella.


Open Opus, Concertmaster and Concertino are free to use but they run on web servers that cost us money. You can help us by supporting us on Patreon - any ammount is more than welcome! $5 supporters get early access to new versions and an exclusive online board to talk about future features.