You could have known this beforehand because the rules state as following:
Please read the following before posting:
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plagiarise someone else's biography of this artist.
* You can copy from Wikipedia, or any other GFDL-licensed source,
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licensed under the GFDL.
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* Artists and labels are not exempt from these rules.
NOTE: Abuse of the Last.fm wiki system will result in banning from the
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Greetings,
Sietse