Question: Vaka is the common name for a track and lead single from which band that takes its name from the frontman's sister, Sigurrós Elín?
Sentence (from "Sigur Rós"): Known for their ethereal sound, frontman Jónsi's falsetto vocals, and the use of bowed guitar, the band's music is also noticeable for its incorporation of classical and minimalist aesthetic elements.
Relevant evidence: No