Answer the following question: Question: "What is Engelbert Humperdinck's last name?"  Context: "Artists contributing to this format include mainly soft rock/pop singers such as, Andy Williams, Johnny Mathis, Nana Mouskouri, Celine Dion, Julio Iglesias, Frank Sinatra, Barry Manilow, Engelbert Humperdinck, and Marc Anthony."  Answer:
Answer:
Humperdinck