Festival organizers wrote on their facebook page that the queues are due to security checks.
Some 24,000 tickets have been sold for the three-day event which started on Friday evening. Summer Sound is the largest dance music festival in the Nordic region.
Among the performers are top Dutch DJ Tiësto, Swedish dance band Avicii and a second top DJ from the Netherlands, Armin Van Buuren.
Speaking to Yle, DJ Tiësto said the entire DJ community wanted to perform in the Nordic countries as dance music is fresh and creative in the region. DJ Tiësto has been performing for over 20 years and is one of the world’s most renowned disc jockeys.
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