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.

Question: Along with Andy Williams, Johnny Mathis, Nana Mouskouri, Celine Dion, Julio Iglesias, Barry Manilow, Engelbert Humperdinck, and Marc Anthony, what notable artist is featured on the soft AC format?
Answer: Frank Sinatra