En las preguntas frecuentes de Android Market en http://www.google.com/support/androidmarket/bin/answer.py?hl=es&answer=1186964&topic=1100184: Para eliminar toda tu biblioteca y retirarte de Google Music, visita http://music.google.com y selecciona "Configuración"> "Retirar de Google Music".
URLS:
http://music.google.com
http://music.google.com
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