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 the theme song from the movie arthur?" whose answer is Christopher Cross.
Each document should contain about 30 words, and these documents should contain useful information.

Query: theme song from the movie arthur
Useful Output:

Doc 1:  Arthur's Theme (Best That You Can Do)" is a song performed and co-written by American singer-songwriter Christopher Cross, which was the main
Doc 2: Christopher Cross - Arthur's Theme (Best That You Can Do) (Lyrics) · Comments.
Doc 3:  song won an Oscar for Best Original Song and spent 3 weeks at  theme from the1981 film Arthur starring Dudley Moore and Liza Minnelli.
Doc 4: Official music video of “Arthur's Theme (Best That You Can Do)” by  theme from the1981 film Arthur starring Dudley Moore and Liza Minnelli.
Doc 5: Arthur • Arthur's Theme (Best That You Can Do) • Christopher Cross · Comments.