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: "when did justin bieber started his music career?" whose answer is 2008.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did justin bieber start his music career
Useful Output:

Doc 1: Justin Bieber was arguably the first YouTube phenomenon turned pop star, shifting the way artists would be discovered and signed to major labels.
Doc 2: Bieber and his mother began sharing his musical talent on YouTube around 2007. The social media website was relatively new at the time, and
Doc 3: for his diverse musical style and worldwide impact on contemporary music. He  Justin Bieber in Tears Over Past Trauma From Music
Doc 4: Justin Drew Bieber (born March 1, 1994, in Stratford, Ontario, Canada) is a Canadian singer and songwriter. He was discovered by his manager Scooter Braun from
Doc 5: Justin Bieber is a Canadian singer and former teen idol whose fresh-faced good looks and appealing pop songs sparked a global craze beginning in 2009. His