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 sang the ballad of john and yoko?" whose answer is the Beatles.
Each document should contain about 30 words, and these documents should contain useful information.

Query: "The Ballad of John and Yoko" singer
Useful Output:

Doc 1: “The Ballad of John and Yoko” is a song by the English rock band the Beatles that was released as a non-album single in May 1969.
Doc 2: Few songs have marked a shift in pop music history like “The Ballad of John and Yoko.” Released by the Beatles in May 1969.
Doc 3: The Song That Silenced The Beatles: 'The Ballad of John and Yoko ❤ #johnlennon #thebeatles #rocknroll #georgeharrison #viralpost #rockmusic.
Doc 4: “The Ballad of John and Yoko” is largely about Lennon and Ono's attempts to get married in March of 1969. It also details their general weirdness at the time.
Doc 5: John and Paul recording "The Ballad of John and Yoko" 1969.