Frank Sinatra was an American singer, actor, and producer who was one of the most popular and influential musical artists of the 20th century. He was known as 'The Voice' and 'Ol' Blue Eyes, ' and was also referred to as a crooner. His career spanned six decades, during which he achieved great success in multiple genres, including jazz, swing, and pop. He won 11 Grammy Awards, including the Grammy Lifetime Achievement Award, and was inducted into the Rock and Roll Hall of Fame.