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Elvis fans wait to tour Graceland during Elvis Presley's 75th birthday celebration in Memphis, Tennessee January 8, 2010. REUTERS/Nikki Boertman

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Elvis estate taps finance firm to sue Arista

NEW YORK (Reuters) - Elvis Presley's estate is turning to a litigation-finance firm to sue Arista Music in Germany for unpaid royalties from ringtones, downloads and apps that feature the icon's hit songs.