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So how did 4-year-old Marc Colleameno of Malden manage to get on stage at the 30 Seconds to Mars show at the Wilbur this week? Apparently, the lad had been singing one of the band’s songs while waiting in line before the show, and someone in the band heard him. Later, when he was spotted down front with his mom, Colleameno was summoned to the stage by singer Jared Leto, who lifted the little boy up and danced with him for a while.