FILE - In this June 28, 2015 file photo, singer-songwriter Merle Haggard performs at the 2015 Big Barrel Country Music Festival in Dover, Del. Haggard has canceled his April concert dates as he recovers from a recurring bout of double pneumonia. The 78-year-old singer of hits like "Okie From Muskogee," ''Mama Tried" and "Workin' Man Blues" had also cancelled dates in February and March. (Photo by Owen Sweeney/Invision/AP, File)
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