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: "Roads was a song that was covered by which Soviet baritone operatic singer?" whose answer is Muslim Magometovich Magomayev.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Soviet baritone operatic singer and their famous covers
Useful Output:

Doc 1: Vadim Cheldiev, a former professional baritone, has been sentenced to 10 years in a strict-regime penal colony.
Doc 2: Dmitri Hvorostovsky was a world-renowned baritone opera singer from Russia. He was known for his powerful voice, his striking good looks, and
Doc 3: A Russian opera singer has pulled out of a star role at this year's Bayreuth Festival in Germany following publicity about a swastika tattoo.
Doc 4: opera singer Dmitri Hvorostovsky, Krasnoyarsk, silver hair, 50 most beautiful people, Russian baritone, vocal art, world opera, classical music, vocalist
Doc 5: American baritone Lawrence Tibbett (1896–1960) leaps immediately to mind because no subsequent singer has possessed his unique sound.