Question: Who was mentor to the man whose works, along with those of Alban Berg, were included in the studio album entitled At the Grave of Richard Wagner?
Sentence (from "At the Grave of Richard Wagner"): At the Grave of Richard Wagner is a studio album by the Kronos Quartet, containing works by Alban Berg and Anton Webern, and a brief "romantic elegy" by Franz Liszt.
Relevant evidence: Yes