If you're in Shanghai, you must check out the Shanghai Museum, which is right in People's Square. It closes at 5, but they stop letting anyone in at 4. (I almost didn't get in.)
Here are some pictures of the great stuff there:
Dunash ibn Tamim was an astronomer, grammarian, and physician, who served as court physician to the Fatimite caliphs of Kairouan (now in Tunisia).
Dunash ben Labrat ha-Levi was a poet, commentator, and grammarian, who among many other accomplisments composed Dror Yikra, a song for the Jewish Sabbath still commonly sung today.