Which building was formally called the sears tower?

In picassos masterpeice bulls head which bicycle part makes up the bulls horn

After first arriving in new york, charlie parker took a job as a dishwasher at jimmy's chicken shack, where played the piano nightly. listening to his astonishing harmonic restructuring, virtuoso phrasing, and breakneck tempos every night for three months, charlie parker challenged himself to adopt these qualities into his playing, and he continued to practice tirelessly.

How did duke ellington create a new musical style that grew out of the ragtime tradition?