On its past editions, the festival had confirmed names such as Florence + the Machine, Thirty Seconds to Mars, The Prodigy, Macklemore, Iggy Pop, Nils Frahm, Skrillex, Bring me the Horizon, Deadmau5, alt-J, Franz Ferdinand, Fatboy Slim, Sigur Ros, Bastille, Rudimental, Thievery Corporation, Twenty One Pilots, Gorillaz, Massive Attack, Chase & Status and many other artists that performed on one of its twelve stages.

[1] Lineup: Morcheeba, Pendulum DJ Set, Feed Me, James Zabiela, Fritz Kalkbrenner, Dub Pistols, Stanton Warriors, A Skillz, Krafty Kuts, Wankelmut, Telepopmusik and many others.

[8] Lineup: The Prodigy, Rudimental, Fatboy Slim, The Parov Stelar Band, The Cat Empire, The Glitch Mob, Maya Jane Coles, Sub Focus, Sigma.

[9] Lineup: Skrillex, Bring Me the Horizon, Sigur Rós, Bastille, Paul Kalkbrenner, Gorgon City, Enter Shikari, Rusko, Flux Pavilion, Dilated Peoples, Camo & Krooked, Pan-Pot and many others.

[10] Lineup: Deadmau5, Franz Ferdinand, Zedd, Alt-J, Paul van Dyk, Moderat, Nero, Duke Dumont, Noisia, Trentemøller, House of Pain and many others.

[11] Lineup: Damian Marley, Jessie J, Mura Masa, Richie Hawtin, Groove Armada, San Holo, Wolf Alice, Subcarpați, Little Big, Kensington (band), Alison Wonderland, Little Boots and many others.

[14] Lineup: Florence + The Machine, Thirty Seconds to Mars, Limp Bizkit, Bring Me the Horizon, CHVRCHES, Sofi Tukker, Metric, The Vaccines, Zeds Dead, Zomboy, Jauz, Sigma, Infected Mushroom, The Black Madonna, TOKiMONSTA, Polo&Pan and many others.

[16] Expected 2021 Lineup: Twenty One Pilots, The Chemical Brothers, Placebo, Foals, Aurora, The Neighbourhood, Machine Gun Kelly, Sheck Wes, Fisher, Zhu, Bicep, Rezz, Amon Tobin and many others.

Hundreds of artists performed on the other stages, among which the most anticipated were: Twenty One Pilots, Gorillaz, Disclosure, Moderat, Caribou, Editors, Mogwai, Yves Tumor, WhoMadeWho, Apashe, Lola Marsh or Balming Tiger.

Headlined by the likes of George Ezra, marking his Romanian debut, and punk legend Iggy Pop, the festival saw exhilarating performances that catered to varied musical tastes.

Noteworthy comebacks included the ethereal Icelandic band, Sigur Ros, rock ensemble, Nothing But Thieves, and drum and bass titans, Pendulum, who graced Bonțida with a live act after a decade-long hiatus.

Major acts that completed the EC9 lineup were: Macklemore, Jamie xx, Tash Sultana, Morcheeba, Frank Carter and the Rattlesnakes, Orbital (band) and Noga Erez.

The festival also hosted a special night in honor of Hospital Records' 25th anniversary, with performances from Netsky, Metrik, Flava D and London Elektricity traversing the drum and bass spectrum.

The festival also featured the eclectic sounds of Ricardo Villalobos, the soulful performances of Paolo Nutini, and the unique vibes of Khruangbin, ensuring unforgettable experiences.

The castle was desecrated during World War II by German troops and neglected by the communist regime in Romania; it is currently being restored by the Transylvania Trust as a cultural center.