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Two music-themed documentaries, one (seemingly) all about darkness and the other (actually) all about light, arrive on Hulu nearly together. “Into the Void: Life, Death and Heavy Metal,” premiering Monday, is an eight-part film — really eight films arranged around the title theme. “Lilith Fair: Building a Mystery,” which premieres Sunday, revisits Sarah McLachlan ’s late-’90s all-female traveling music festival. From these extremely disparate approaches to subject matter, volume and vocals have been wrought often moving testaments to self-expression, community and finding a voice in a world that might not want you to be heard, or at least to help you do it. You may learn something,

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