From 5pm until midnight on July 5, 6 and 7 there are acts playing in the square outside the historic seat of local government, as well as some acts performing their sets inside.
Today sees L'Impératrice, Jeanne Added, Voyou, Petit Biscuit and Vitalic, while Dominique A performs indoors.
Tomorrow has Angele, Synapson and Feder among others while Sting and Shaggy play indoors. Saturday includes L'ordre du périph, Gaelle Faye and Ibeyi.
Each day also has a playlist from a leading French indie label, Enterprise, Believe and STRN.
While there's no denying it's a great bill, it's also worth noting that it's free. You could hardly imagine a similar event being staged in London without a hefty ticket price.
I know there are strong arguments against music being involved with commercial organisations, but when the end result is an event that is not only artistically robust but also accessible to all, there's no denying the merit of it.
Fnac is of course one of France's biggest consumer brands for buying music, so it's a really positive thing to see them stage an event like this. It encourages interest in music, gets the acts to potential fans and benefits the brand. Everyone wins!