Place de la Concorde is a location in Rhythm Thief and the Emperor's Treasure. It is a large area that can be accessed from Hôtel de Cillon, Musée d'Orsay Station, and Champs-Élysées any time before Chapter 10. Raphael first meets Marie here when she plays the violin for Emilie. It is also where the optional minigame Operation: Love can be unlocked by speaking to Armand in Chapter 5.
The very first scrap of the Phantom Notes is located on the right side of the area, and the Fountain sound needed for the Master Instrument can be recorded from the fountain in the center of the area. Sapphire the bulldog's growl is also recorded on the left side of the fountain to get past Eric in Chapter 1.