Frank Sinatra, Barbra Streisand, Tony Bennett, Johnny Mathis. Few singers have enjoyed the longevity or the popularity as these four legendary names. They are part of American pop-culture history.

Add Yahoo as a preferred source to see more of our stories on Google. Johnny Mathis, who in the 1950s created an enduring niche as a singer of classy romantic pop ballads, turns 90 on Tuesday (Sept.