Let's broaden the search:
What is your search for? Are you including enough key words?
Basic level = "Billie Holiday" or "billie holiday blues"
Why not try a qualitative idea? = "Billie Holiday legacy"
Why not try a perspective? = "Billie Holiday and the rise of female blues"
Articles? Independent, Smithsonian, Guardian Comment - all are good online for arts/culture commentary
Look for: facts, content, writing style, balance of opinion to musical elemental commentary, reference to lyrics (rather than bar numbers)
Permission granted to go tangental!
Here are the links I used today:
https://www.smithsonianmag.com/arts-culture/what-makes-billie-holiday-so-powerful-today-180954893/