The Ark has announced a pretty amazing double-headliner concert by Mary Chapin Carpenter and Shawn Colvin.

The two much-loved singer-songwriter-musicians will play the Power Center on May 21 as part of a tour that's already under way.

Tickets — at $30, $45 and $60 — go on sale at 10 a.m. Saturday via the Michigan Union Ticket Office.

Although Colvin has been a fairly regular visitor to Ann Arbor in recent years, it's been quite a while since Carpenter has played in town.

From the concert announcement:

Acclaimed songwriters (and longtime friends) Mary Chapin Carpenter & Shawn Colvin share the stage as an intimate duo, performing material spanning their vast catalogues as well as some of their favorite songs.

Mary Chapin Carpenter has recorded 12 albums and has sold more than 13 million records. With hits like ‘Passionate Kisses’ and ‘He Thinks He’ll Keep Her’, Carpenter has won five Grammy Awards (with 15 nominations), two CMA awards, two Academy of Country Music awards for her vocals and was inducted into the Nashville Songwriters Hall of Fame in October of 2012. Her songs speak to the most personal of life’s details and the most universal. Ashes and Roses, the new album from Carpenter, was released June 12, 2012, by Zoë/Rounder. This is Carpenter’s 12th studio album and features a special duet with James Taylor on the track ‘Soul Companion’.

Shawn Colvin has won three Grammy Awards, including two for the hit single ‘Sunny Came Home’, and has been nominated for another seven. She has released 10 albums, appeared on countless television and radio programs, had her songs featured in major motion pictures and created a remarkable canon of work. In June, Colvin released her eighth studio album, "All Fall Down." Recorded in Nashville and produced by her longtime friend Buddy Miller, it features a group of stellar musicians including Alison Krauss, Emmylou Harris, Bill Frisell and Jakob Dylan. The album’s release coincided with the publication of Shawn’s memoir, "Diamond In The Rough." Diamond in the Rough looks back over a rich lifetime of highs and lows with stunning insight and candor. In its pages we witness the inspiring story of a woman honing her artistry, finding her voice, and making herself whole.

Bob Needham is director of entertainment content for AnnArbor.com. Reach him at bobneedham@annarbor.com or 734-623-2541, and follow him on Twitter @bobneedham.