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Willie Nelson and Alison Krauss won't be starting their collaborative tour next week as originally planned.  They've each posted messages on their websites, explaining that "an unforeseen and urgent health concern" forced them to change their plans. 

They don't offer any specifics regarding the medical issue or who is directly involved, but indicate that it has to do with a member of Alison Krauss and Union Station. 

The first six dates of the trek, which was to begin in Murray, Kentucky on May 1st, have been rescheduled, while the May 17th show in Birmingham, Alabama and the May 18th concert in Augusta, Georgia have been cancelled. 

Ticket refund information is available at  The tour is now set to begin in Daniel Island, South Carolina on May 8th. 

Willie Nelson & Family-Alison Krauss & Union Station Featuring Jerry Douglas Rescheduled Tour Dates 

May 8 - Daniel Island, South Carolina, at the Family Circle Stadium 
May 9 - Simpsonville, South Carolina, at the Charter Amphitheater 
May 10 - Greensboro, North Carolina, at the White Oak Amphitheater 
May 11 - Huntington, West Virginia, at the Big Sandy Superstore Arena 
May 13 - Roanoke, Virginia, at the Roanoke Civic Center 
May 14 - Columbus, Ohio, at the Schottenstein Center 
May 16 - Nashville, Tennessee, at The Woods at Fontanel 
May 17 - Atlanta, Georgia, at the Chastain Park Amphitheater - rescheduled from May 2 
May 18 - St. Augustine, Florida, at the St. Augustine Amphitheater - rescheduled from May 6 
May 19 - Cary, North Carolina, at the Koka Booth Amphitheater - rescheduled from May 4 
May 21 - Murray Kentucky, at the CFSB Center - rescheduled from May 1 
June 5 - Southaven, Mississippi, at the Snowden Grove Amphitheater 
June 6 - Louisville, Kentucky, at the Louisville Waterfront Park 
June 7 - Lewiston, New York, at Artpark 
June 8 - Bethel, New York, at the Bethel Woods Center for the Arts 
June 10 - New York, New York, at Radio City Music Hall 
June 11 - Bethlehem, Pennsylvania, at the Sands Bethlehem Event Center 
June 13 - Philadelphia, Pennsylvania, at the Mann Center for Performing Arts 
June 14 - Columbia, Maryland, at the Merriweather Post Pavilion 
June 15 - Simsbury, Connecticut, at the Performing Arts Center 
June 17 - Boston, Massachusetts, at the Blue Hills Bank Pavilion 
June 19 - Bangor, Maine, at the Darlings Waterfront Pavilion 
June 20 - Gilford, New Hampshire, at the Bank of New Hampshire Pavilion 
June 21 - Canandaigua, New York, at CMAC 
July 6 - Kansas City, Missouri, at the Starlight Theater 
July 7 - Rogers, Arkansas, at the Arkansas Music Pavilion 
July 9 - Oklahoma City, Oklahoma, at the Zoo Amphitheater 
July 11 - Council Bluffs, Iowa, at Harrah's Council Bluffs 
July 12 - Highland Park, Illinois, at the Ravinia Festival 
July 13 - Sterling Heights, Michigan, at the Freedom Hill Amphitheater 
July 15 - Rama, Ontario, Canada, at the Casino Raman 
July 17 - Interlochen, Michigan, at the Interlochen Center for the Arts 
July 18 - Toledo, Ohio, at the Toledo Zoo 
July 20 - Knoxville, Tennessee, at the Thompson-Boling Arena - rescheduled from May 3 

Photo Credit Getty Images