sentences:  Frank Sinatra, Doris Day, Ella Fitzgerald, Dinah Shore, Dean Martin, and Bing Crosby).Some of these vocalists faded with traditional pop music, while many vocalists became involved in 1960s vocal jazz and the rebirth of "swing music"; the swing music of the 1960s is sometimes referred to as easy listening and was, in essence, a revival of popularity of the "sweet" bands that had been popular during the swing era, but with more emphasis on the vocalist.Like the Swing Era, it too featured many songs of the Great American Songbook.