Indigo Girls [ tickets ], who finished a tour of the eastern US last month, are assembling a summer trek that stretches from New York to California.

The Grammy-winning folk-rock duo currently has 26 dates scheduled, beginning May 31 in Richmond, VA, and wrapping July 19 in Peekskill, NY. They'll visit a wide variety of venues, including The Big Apple's famed Radio City Music Hall, as well as a couple of festivals. Details are listed below.

Indigo Girls continue to support their 10th studio album, "Despite Our Differences," which surfaced in 2006 and peaked at No. 44 on The Billboard 200. The set also represents Amy Ray and Emily Saliers' 20th anniversary of record making, though they didn't make a big fuss about it. They instead have focused their promotional energies on activist efforts, like their ongoing work with Honor the Earth, a Minneapolis-based non-profit dedicated to energy justice within the Native American community.

"Despite Our Differences," produced by Mitchell Froom (Paul McCartney, Sheryl Crow), is the Indigo Girls' first album for Hollywood Records and features guest artists including Brandi Carlile and Pink. A couple of songs from the set are streaming at the performers' MySpace page and the Girls also have their own YouTube channel, where fans can check out all their latest videos.

The Indigo Girls' next release will come in the form of a DVD--"Live at the Roxy"--which premiered last month on high-definition television channel HDNet and is scheduled to hit stores later this spring.