This talk is about music but is not restricted to musicians!
When playing an instrument in a jam session, musicians sometimes need to see the chords of the tune they are playing. A chords chart is a convenient way to represent a music tune as a table, containing chord names in "Jazz notation", but not music notes. Chords charts are scattered on forums, are static images most of the time, and there are many versions of which some are wrong.
These drawbacks led me to start the Open Chords Charts project. The backend is a centralized and collaborative database of chords charts. The frontend, written in Elm, allows to browse charts, add/edit them, fork other users charts, fix errors and make links between charts. I'll show some features such as changing the key in which the song is displayed – a killer feature for musicians who dislike to do the transformation in their head. The frontend is responsive and offline-first, so that musicians can build a set-list and follow the songs on their mobile phone while play