Indigo Girls — Amy Ray and Emily Saliers — currently on a summer tour with dates issued through July 19, have added a 20-date, 17-city fall leg. The tour begins September 11 in Spartanburg, SC and continues through October 5, which includes a three-night run at Mohegan Sun in Connecticut. More dates are to come.

Ray and Saliers continue to tour behind their 2006 release, “Despite Our Differences.”

Indigo Girls’ new album will be out in February and marks their first indie album since 1987 when they released “Strange Fire.” In addition to the studio tracks recorded with their band — Matt Chamberlain on drums, Clare Kenny on bass and Mitchell Froom on keyboards — they will also release an acoustic version of the songs plus at least one new song not on the band’s album.

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Indigo Girls tour dates:

June 20 Long Beach, CA Long Beach Terrace Theater
June 24 Yountville, CA Lincoln Theater
June 25 Santa Cruz, CA The Catalyst
June 27 Veneta, OR Secret House Vineyard
June 28 Portland, OR Oregon Zoo Amphitheatre
June 29 Seattle, WA Woodland Park Zoo Amphitheatre
July 10 Ridgefield, CT Ridgefield Playhouse
July 11 Lowell, MA Boarding House Park
July 12 Newport, RI Newport Sunset Music Festival
July 13 Concord, NH The Capitol Center for the Arts
July 15 Rutland, VT The Paramount Theatre
July 16 Hyannis, MA Cape Cod Melody Tent
July 17 Vienna, VA Wolf Trap Filene Center
July 18 Wilmington, DE Grand Opera House
July 19 Peekskill, NY Paramount Center for the Arts
September 11 Spartanburg, SC Neighborhood Theater
September 12 Hilton Head, SC Shoreline Ballroom
September 13 Atlanta, GA Chastain Park
September 14 Charlotte, NC Neighhborhood Theatre
September 16 Norfolk, VA The NorVa
September 17 Baltimore, MD Ram’s Head
September 19 Stamford, CT Palace Theater
September 20 Troy, NY Savings Bank Music Hall
September 21 Great Barrington, MA The Mahaiwe
September 22 Verona, NY Turning Stone Resort & Casino
September 24 Kingston, NY Broadway Theatre at Ulster Performing Arts Center
September 25 Atlantic City, NJ House of Blues
September 26-28 Uncasville, CT Mohegan Sun Cabaret Theatre
September 30 Geneva, NY Smith Opera House
October 2 Athens, OH Templeton-Blackburn Memorial Auditorium at Ohio University
October 3 Columbus, OH Lifestyle Communities Pavilion
October 5 Joliet, IL Rialto Square Theatre