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 sings on the dark side of the moon?" whose answer is Pink Floyd.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Who sings on Pink Floyd's The Dark Side of the Moon?
Useful Output:

Doc 1: Mainly David Gilmour, Rick Wright typically does harmonies, but did sing lead at times and also Roger Waters sang as well. If you want to know
Doc 2: Wright's vocals come in to harmonize in the crescendo of the choruses, as do the voices of Doris Troy, Leslie Duncan, Liza Strike and Barry St.
Doc 3: 1. Dark Side of the Moon was the first Pink Floyd album to feature Roger Waters as its sole lyricist.  Roger Waters had been contributing
Doc 4: When Roger Waters first played Pink Floyd's 'Dark Side of the Moon' for his wife, she was so moved she burst into tears. Watch as he reflects on
Doc 5: Why Roger Waters remade The Dark Side of the Moon · Comments2.1K.