Ella Fitzgerald was the chief executive of the American Popular Songbook, because of its incomparable qualities and careful material selection. With producer Norman Granz put them onto different composers dedicated 'song books' on vinyl. Thus Fitzgerald made final versions of the songs of the most important American songwriters. Fitzgerald had a huge vocal range and for most of her career her voice
… retained the youthful, slightly vibrating sound. Therefore its versions sounded remarkably fresh, especially her 'scat' material. Although many excellent artists have followed her, there probably will never be one more rise to the American Songbook as performed sublime.more