Frank Sinatra, 'Ol' Blue Eyes,' was the first modern pop superstar. He revolutionized singing by using the microphone as an instrument, allowing for an intimate, conversational style known as 'crooning.' His phrasing, influenced by jazz trombonist Tommy Dorsey, allowed him to sing long melodic lines without breaking for breath. After a career slump in the early 1950s, he staged a massive comeback with 'In the Wee Small Hours' (1955), often cited as the first true 'concept album.' A founding member of the Rat Pack, Sinatra was a cultural icon whose influence spanned music, film, and politics. With hits like 'My Way' and 'Fly Me to the Moon,' he remains the definitive interpreter of the Great American Songbook.