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: "Graham Stack  has written and produced hit records for many artists including a singer who relinquished her American what?" whose answer is citizenship.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Graham Stack produced artists
Useful Output:

Doc 1: The superbly talented Graham Stack has worked with incredible artists including Tina Turner, Westlife, Girls Aloud, Rod Stewart , Dannii Minogue, Kylie , James
Doc 2: Record Producer and Songwriter Graham Stack has updated his Monolith Studio in Surrey UK to includes our DecoCircle Clouds #gikacoustics
Doc 3: Music producer at Graham Stack Productions Ltd · Experience: Graham Stack Productions Ltd · Location: Kingston Upon Thames · 104 connections on LinkedIn.
Doc 4: JAMES ARTHUR - KYGO - KYLIE MINOGUE - LEANNE RIMES - Graham Stack is a multi Gold and Platinum Certified Professional Record Producer and Songwriter with many
Doc 5: Graham Stack is an English born record producer and songwriter who has written and produced hit records for many artists including James Arthur, JLS, Kylie