Question: Dan Elkan has appeared on recordings by what American singer who has sold more than 50 million records worldwide?
Sentence (from "Dan Elkan"): Elkan also co-produced Zach Hill & Holy Smokes' "Masculine Drugs" 2004 and Holy Smokes' "Talk to Your Kids about Gangs" 2006 as well as Alela Diane's 2009 album "To Be Still".
Relevant evidence: No