Nuits Sonores is a free festival that takes place every May in Lyon, France. The festival features a diverse lineup of electronic music artists, making it a must-see for music lovers. The festival has a rich history dating back to 2003 and has become one of the most popular music festivals in Europe. The festival takes place in various locations throughout the city, creating a unique and exciting atmosphere. The festival is a great choice for budget-conscious travellers as it is completely free to attend and offers a thrilling and unforgettable experience.