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 "Siegfried Lipiner"): A poet and dramatist of highly individual character, he is today remembered in German-speaking literary circles mainly for his translations of the Polish poet Adam Mickiewicz; he is also known to music history as having been a close friend of Gustav Mahler.
Relevant evidence: No