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: "Christopher Amott and Karen Carpenter, have which mutual occupation?" whose answer is singer.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Christopher Amott Karen Carpenter music
Useful Output:

Doc 1: Hammergren's McKesson career includes posts as president of Supply Management and as executive vice president for the pharmaceutical, medical.
Doc 2: I'm excluding those singers whose main genre of music is closer to “pop” than to “rock”, such as Karen Carpenter, Carly Simon, Maria Carey,
Doc 3: This year's theme is “I Am Every Woman — Electric,” and the music will honor an array of musical icons including Nina Simone, Cher, Whitney
Doc 4: Arch Enemy, a Swedish melodic death-metal band, Michael and Christopher Amott  The Carpenters, American melodic pop duo, Karen and Richard Carpenter
Doc 5: The roots of this dissertation are many, and it would not have been possible without the generosity and guidance of numerous people and institutions.