What does this mean: "tanto instrumental como vocal, poco se sabe."?

Question

This was a phrase I found in a book, and I'm not a fluent Spanish speaker, so I was wondering what it meant. Thank you in advance.

Answer 1

both instrumental and vocal, little/not much is known

Answer 2

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both instrumental and vocal, little is known

Answer 3

both instrumental and vocal, not much is known

Answer 4

as instrumental as it is vocal, little is known.