Balaton Sound (also known as Heineken Balaton Sound between 2007 and 2012 and as MasterCard Balaton Sound since 2013 for sponsorship reasons) is one of Europe's largest open air electronic music festivals. Held annually since 2007 on the southern bank of Lake Balaton, Hungary, it features live acts and DJs from all around the world, from established artists to new names. The event was co-created by the organizers of Sziget Festival.