How to remove your Google Music account
How to remove your Google Music account
From the Android Market FAQ on http://www.google.com/support/androidmarket/bin/answer.py?hl=en&answer=1186964&topic=1100184:
To delete your entire library and withdraw from Google Music, visit http://music.google.com and select ‘Settings’ > ‘Withdraw from Google Music’.
Direct removal link: http://music.google.com
Cannot delete the account, or worried the data lingers? See what to do when a site won’t let you delete.