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 lead vocals on eye of the tiger?" whose answer is Dave Bickler.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who sang lead vocals on eye of the tiger
Useful Output:

Doc 1: So spider Rico on drums, AKA mark drew bay, and then lead vocals.  voice of Dave Bickler singing Eye of the Tiger. Immediately. You
Doc 2: Dave Bickler was part of the group for their first four albums: Survivor, Premonition, Eye of the Tiger, and Caught in the Game. He served as
Doc 3: The Voice Of “Eye of the Tiger” Dave Bickler Hits The Late Show With Stephen Colbert · Writer: Deko Entertainment. Deko Entertainment · May 21,
Doc 4: “Tony Scotti and Sly Stallone were friends,” he said. “Way before 'Eye of the Tiger.' They were out to dinner one night. And Tony asks Sly when
Doc 5: Dave Ling was a co-founder of Classic Rock magazine. His words have appeared in a variety of music publications, including RAW, Kerrang!, Metal