Indigo was born in the belly of Sydney, Newtown, named after the Duke Ellington song Mood Indigo, to two artist-musician parents who brought her up on Joni Mitchell and Neil Young, so the thread of this is woven through her blood. Following her Steiner education as a child, she went on to attend a performing arts school and then did three years at acting school, which ultimately led her to pursue her music career. It was in Australia that she met the band Big Thief, doing a support show for them and grew close with the band's front woman Adrianne Lenker, who then went on to co-produce Indigo’s debut album released on Sacred Bones Records, Echo. The record received much critical acclaim. Pitchfork said of the album, "As with [Big Thief’s Adrianne] Lenker, there is a weird magnetism just beneath the surface. Sparke sings with quicksilver emotional ferocity, flickering out of her head voice into a lower register that hints at wilder, more elemental feelings. The atmosphere is rapt, the silences charged. The longer you spend sinking into her music, the more you realize its essence is not airy, but inky and dense, and Echo is a dark little star of intimacy and intensity." Additionally, Gorilla vs Bear said, "Achingly beautiful and heart-wrenching... feels impossibly intimate and vast at once, like a cherished secret that, once shared, becomes universal truth."

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