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 performed at halftime of super bowl 2017?" whose answer is Lady Gaga.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who performed at super bowl 2017 halftime show
Useful Output:

Doc 1: Ga-ga, oh la la. Lady Gaga's Super Bowl halftime show did not disappoint, unfurling appropriately enough after a startling first half that saw
Doc 2: Lady Gaga starred in the Super Bowl LI halftime show, and she did not disappoint. The superstar began her show on the roof of Houston's NRG Stadium.
Doc 3: Year-by-Year Performer List ; Super Bowl 50. Feb. 7, 2016. Coldplay, Beyonce, Bruno Mars, Mark Ronson ; Super Bowl LI. Feb. 5, 2017. Lady Gaga.
Doc 4: 2017, Super Bowl LI: Lady Gaga (NRG Stadium in Houston). 2016, Super Bowl 50: Coldplay featuring Beyoncé and Bruno Mars (Levi's Stadium in
Doc 5: With Kendrick Lamar set to perform at the Super Bowl halftime show, look back at every artist who has done so in the past.