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Radio Heartland is a 24-hour service featuring acoustic, Americana and roots music. Radio Heartland is available in the Twin Cities on KNOW-FM 91.1 HD2 and worldwide on the internet at www.radioheartland.org. KNOW-FM (91.1 FM) is the flagship radio station of Minnesota Public Radio's "news and information" network, primarily broadcasting a talk radio format to the Minneapolis-St. Paul market. The frequency had previously gone under the call sign KSJN, but the purchase of a commercial station at 99.5 MHz in 1991 allowed MPR to broadcast distinct talk radio and classical music services.