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: "who had a number one hit with moon river?" whose answer is Danny Williams.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who had a number one hit with moon river
Useful Output:

Doc 1: Somewhat confusingly, in the UK, the first hit version of “Moon River” was recorded by a guy called Danny Williams, who was clearly a completely
Doc 2: It was Andy Williams who scored the big hit with “Moon River.” Now I know there are people who will argue that Williams was a great singer, but
Doc 3: Over in the U.K., Danny Williams – aka Britain's Johnny Mathis – scored a No. 1 hit with the tune
Doc 4: Composed by Henry Mancini with lyrics by Johnny Mercer, “Moon River” was originally performed by Audrey Hepburn in the 1961 movie Breakfast
Doc 5: Audrey Hepburn herself intervened and in the end, Moon River remained, earning Mancini and Mercer an Oscar in 1961 for best original song and