Pandora's latest attempt to lower its royalty obligations is its most unconventional. The Internet radio giant has purchased adult top 40 KXMZ-FM Rapid City, S.D. Terms of the deal weren't disclosed.

KXMZ is in the country's 255th-largest radio market as of the spring ratings period, according to Arbitron, with a population of 108,000. Nearly 71 million people listen to Pandora's Internet radio service every month.

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