As the name suggests, the Rock in Rio festival originated in Brazil but was exported to Lisbon 10 years ago and is now also held in Madrid.
According to Rock in Rio, over two million people have passed through the gates of the City of Rock over the past 10 years. This year around 350,000 music fans of all ages went to the Lisbon festival.
Headliners included Robbie Williams, The Rolling Stones, Lorde, Arcade Fire and Justin Timberlake.
Seen as one of the biggest festivals in the world, it is also probably one of the most diverse, attracting fans of all ages and many families.
Participants say it is about the atmosphere, the location, being outdoors so they can bring the kids. They also appreciate that the festival is aimed at the whole family and that the atmosphere is like a family reunion, a gathering.
Canadian indie rockers Arcade Fire are currently touring Europe before tackling North America this summer. They played a hot set at Rock in Rio, as did Lorde, from New Zealand. But for many, the highlight was Justin Timberlake who headlined the festival.
Next year for the first time there will also be a Rock in Rio festival in Las Vegas.