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 sung the song i can only imagine?" whose answer is Bart Millard.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who sang i can only imagine
Useful Output:

Doc 1: The movie starring J. Michael Finley as Christian music singer Bart Millard and Dennis Quaid as his abusive father is shocking everyone in Hollywood with its
Doc 2: Bart Millard couldn't have imagined the impact a hastily written song would have on the world when he first penned I Can Only Imagine, alone on
Doc 3: "I Can Only Imagine" - MercyMe ft. Trace Adkins - K- LOVE Fan Awards 2018. The 2018 K-LOVE Fan Awards may be over, but the memories will always
Doc 4: Bart Millard of MercyMe penned the song the film was based on, telling the story of how God radically transformed the life of his once abusive father.
Doc 5: When Christian rocker Bart Millard was first approached with the idea of turning his life story into a movie, he never imagined it would go