Girl group f(x)'s members Luna and Amber will perform in Ultra Korea 2015, the world's premier electronic music festival.

"Luna and Amber are listed in the main stage lineup and they will sing the festival's theme song," Ultra Korea commented.

Ultra Korea began in 2012. Every year, about 100,000 people attend the festival at the Seoul Sports Complex located in Jamsil. It is said that this year's event, the 4th Ultra Korea Music Festival, will be more intense than ever before.

This year's lineup received many positive comments for its arrangement of popular artists such as Snoop Dogg, Skrillex, Alesso, David Guetta, Hardwell, and Knife Party. Ultra Korea 2015 also includes many talented Korean artists of various genres such as K-pop, hip-hop, progressive house, electro house, techno, disco, trance, and more.

2NE1's CL is also scheduled to appear at the music event and anticipation continues to rise for her upcoming American debut.

f(x) members Luna and Amber are scheduled to sing the festival theme song on June 12th with Justin Oh, the representative producer of Korea. Every year, the honor of singing the theme song was given to talented Korean artists and popular DJs and producers. Artists Horan, Bada, and Younha were given the honors in 2012, 2013, and 2014, respectively.

People's anticipation for this year's theme song performance is very high as Luna and Amber are not only known for their vocals, but they have also gained much popularity from entertainment shows.

Additionally, rising Korean DJs such as Sunny Terrace, Vandal Rock, and Inside Core will perform in Ultra Korea 2015 and introduce their style of music.