Ella Fitzgerald, often referred to as the "First Lady of Song," was a prominent American jazz vocalist renowned for her impeccable diction, intonation, and improvisational ability, particularly in her scat singing. Active career-wise from the mid-1930s to the mid-1990s, she worked with notable musicians such as Louis Armstrong, Duke Ellington, and Frank Sinatra. Fitzgerald's distinctive vocal quality and innovative interpretations of jazz standards significantly influenced the genre. Her influential works include hit songs like "Summertime" and "Dream a Little Dream of Me," and she is also celebrated for her Songbook series, dedicated to the works of American songwriters like Cole Porter and the Gershwins.