From Halopedia, the Halo wiki
At some point between 2546 and 2548, the band was formed by Hugo Chastain, Alex Linville, Xavier Dupont and Dorian Nguyen. By 2548, Hugo, Alex and Xavier had graduated from high school a few years before while Dorian remained in high school.
In 2548, the band held a concert in the Brume-sur-Mer bomb shelter. However, the town experienced a brief power outage that interrupted the concert, though the band picked up immediately after it came back on. After the concert ended, the band broke into an abandoned tourist house and sat around strumming their guitars until finally going home to bed shortly before dawn. The concert drew the interest of Tomas Reynés who invited the band to play on his boat the next night.
The following night, during Drowning Chromium's first song, the audience became distracted by what turned out to be a Covenant SDV-class heavy corvette on its way to Brume-sur-Mer. The corvette and several Yanme'e soldiers attacked the boat, sinking it and killing the hundreds of passengers. Dorian managed to escape,. but Hugo, Xavier and Alex died in the attack.
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