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: "Which nursery rhyme with a Roud Folk Song Index number of 821 was used to name the show What Are little Girls Made Of?" whose answer is What Are Little Boys Made Of?.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Roud Folk Song Index number 821
Useful Output:

Doc 1: [traditional] ( special purpose artist ). part of: Roud Folk Song Index (number: 821). 0:57. 37 · Where Are You Going to My Pretty Maid?
Doc 2: 5/24/2004 Texas Folk Music Foundation. Stuart Vexler, Ph.D. 605 B Baylor. Austin. TX. 78703-. (512) 474-8550. (512) 327-2811 s.vexler@twobits.
Doc 3: "What Are Little Boys Made Of?" is a nursery rhyme dating from the early 19th century. It has a Roud Folk Song Index number of 821.
Doc 4: Archives of the Vaughan Williams Memorial Library, the free folk arts resource from the English Folk Dance and Song Society.
Doc 5: The Folk Song Index is an online database designed to help people find English-language traditional folk songs from all over the world.