Caption from poster__

Bessie Smith's
 Jail House Blues"

starts with what seems like a basic opening line:

Thirty days in jail
with my back turned to the wall

She turns it into blues poetry, centering her force upon a few words,
each of which she catches, elongates, drags upward or downward
(the repeat of "turned to the wall," for instance, Smith uses to fill out
the two bars where normally a trumpet or piano would've come in---
she stretches the phrase into a long moan).

So it actually should read:

Thirty DAYS in JAIL
with my BACK TURNED
to the WALL TURRRRNED
to the WALLLLL

Smith, Bessie, 1894–1937, American singer, b. Chattanooga, Tenn. About 1910 Smith became the protegee of Gertrude (Ma) Rainey, one of the earliest blues singers. After working in traveling shows she went to New York City, where she made (1923–28) recordings, accompanied by such outstanding artists as Louis Armstrong, Fletcher Henderson, and James P. Johnson. She quickly became the favorite singer of the jazz public. The power and somber beauty of her voice, coupled with songs representing every variety of the blues, earned her the title “Empress of the Blues.” Around 1928, changing popular taste and her growing alcoholism led to a decline in her popularity. Though she continued to tour, her last years were embittered. She died after an automobile accident while on tour in Mississippi, the circumstances of which are discussed in Edward Albee's play The Death of Bessie Smith (1960). Numerous critics regarded her as the greatest of all jazz artists, and her fame increased enormously after her death.