In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.

"Liza (All the Clouds'll Roll Away)" is a song composed by George Gershwin with lyrics by Ira Gershwin and Gus Kahn. It was introduced in 1929 by Ruby Keeler (as Dixie Dugan) in Florenz Ziegfeld's musical "Show Girl". The stage performances were accompanied by the Duke Ellington Orchestra. On the show's opening night in Boston on June 25, 1929, Keeler's husband and popular singer Al Jolson suddenly stood up from his seat in the third row and sang a chorus of the song, much to the surprise of the audience and Gershwin himself. Jolson recorded the song a few days later on July 6, 1929, and his rendition rose to number nine on the charts of the day. Question: What American singer, film actor and comedian, suddenly stood up during a performance of Gershwin's Liza (All the Clouds'll Roll Away) and started singing? Answer: Al Jolson
Liza All the Cloudsll Roll Away is a song composed by George Gershwin with lyrics by Ira Gershwin and Gus Kahn.