That you mention Billie Eilish, I think she is in a category all her own, to me...The only other person I can think of that even comes close to her writing skills at such a young age is her brother...
And her singing, I don’t think she knows how good she is, yet...Her phrasing is crazy...
I like what Sza does too. She kinda reminds mey of a thinking woman’s Josephine Baker...If one can imagine that.