Luxembourg's capital city comes alive each year on the 22nd - 23rd of June for the National Day celebrations. The highlight is the free, two-day "City Sounds Luxembourg" open-air concert series. The event featured performances by Lost Frequencies, Wade, Flavour Trip, The 1975, and The Script on a grand stage equipped with state-of-the-art audio technology. The powerful sound system, which included TT+ line array modules from the TTL series, ensured that the performances could be heard loud and clear across the massive venue. This video takes you behind the scenes of City Sounds Luxembourg, with the assistance of the RCF Germany application engineer, Thomas Mundorf.