Frank Sinatra was popular.
Frank Sinatra . He is one of the best-selling music artists of all time , having sold more than 150 million records worldwide . Sinatra 's professional career had stalled by the early 1950s , and he turned to Las Vegas , where he became one of its best known performers as part of the Rat Pack . After his death , American music critic Robert Christgau called him `` the greatest singer of the 20th century '' , and he continues to be seen as an iconic figure .