You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Al Jolson who stared in a 1927 "talkie" was once dubbed what?" whose answer is "The World's Greatest Entertainer.".
Each document should contain about 30 words, and these documents should contain useful information.

Query: Al Jolson dubbed as
Useful Output:

Doc 1: Al Jolson was an American singer, comedian, and actor. In his heyday, he was dubbed "The World's Greatest Entertainer. His performing style was brash and
Doc 2: Al Jolson, born Asa Yoelson (May 26, 1886 – October 23, 1950) At the peak of his career, he was dubbed "The World's Greatest Entertainer".
Doc 3: Al Jolson” (May 26, 1886 – October 23, 1950) was born Asa Yoelson in part of the Russian Federation that is now known as Lithuania.
Doc 4: Jolson has been dubbed "the king of blackface" performers, a theatrical convention since the mid-19th century. He was also dubbed "The
Doc 5: Al Jolson was an American singer, comedian, and stage and film actor. At the peak of his career, he was dubbed "The World's Greatest Entertainer".