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Ziera, the band leader of the trio, he was a nice person, getting along with everyone quite nicely. Iris had always looked up to him, after all, he was nice and always gave out helpful tips.
Iris music, IRIS, had a motive called Iris's 4th tick, meaning that you had to land doubles on the fourth tick, thee other two members, Ziera and Lester liked the idea.
Lester's music, SURREAL, had a motive where you had to do two different melodies, it was a challenge to people. Not only that, Lester also made another motif on the song, it's basically an advanced version of the Iris's 4th tick.
Ziera's music, ZIERA, was a mix of all the above and some of his own, but, the song was never finished.
While performing ZIERA, Ziera, mysteriously disappeared when the lights were shut off. No one knows where he went, no one knows if he's still even alive.
Ziera's disappearance made the other two members devastated, notably on Iris.