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Avoiding the sophomore slump, Troye Sivan flourishes on “Bloom,” his follow-up to 2015’s “Blue Neighbourhood.” Check out these five standouts from the 23-year-old singer-songwriter’s new album. “Seventeen” “Boy becomes a man now,” Sivan croons on the coming-of-age “Bloom” opener. With a sumptuous soundscape that has a haunting melancholy streak, this widescreen ballad — about an...