The 2017 Sónar festival in Barcelona, Spain. This year’s gathering was the biggest yet. Credit Stefano Buonamici for The New York Times

The 2017 Sónar festival in Barcelona, Spain. This year’s gathering was the biggest yet. Credit Stefano Buonamici for The New York Times

The 2017 Sónar festival in Barcelona, Spain. This year’s gathering was the biggest yet. Credit Stefano Buonamici for The New York Times