WASHINGTON -- Alberta-born songstress Joni Mitchell headed up a procession of musical luminaries past and present Wednesday at a gala celebration of her latest lifetime achievement: the Library of Congress Gershwin Prize for Popular Song.

A roster of performers including Marcus Mumford, Annie Lennox, Cyndi Lauper and Brandi Carlile lit up the stage in tribute to Mitchell at DAR Constitution Hall, a historic venue just down the street from the White House.

Mitchell, 79, is the first Canadian and only the third woman to collect the prestigious accolade since it was established in 2007.

The stage was decorated with 12 enormous paintings framed by spotlights, some of them self-portraits of Mitchell herself.

Mitchell was seated in the front row wearing her trademark gold beret and sunglasses, her hair in braids.

Mumford kicked off the proceedings with “Carey,” from the seminal 1971 album “Blue,” long a fixture on all-time best-album lists all over the world.

“Tonight it's all about Joni,” Mumford said by way of introduction. “Joni, it has been one of the great privileges of my life to get to play in your band, to play songs at your house. I love you very much.”

Mitchell grinned and mouthed the lyrics along with Mumford throughout Carey.

Lennox took over with “Both Sides, Now,” from the sophomore 1969 effort “Clouds.” Her version brought the house down with a standing ovation. Even the musicians applauded her.

A handler helped Mitchell to her feet to join in the thunderous ovation.

Angelique Kidjo, the four-time Grammy winner from the West African country of Benin, then delivered her version of “Help Me.”

One musical highlight arrived midway through the set: Carlile, Kidjo, Lauper and Lennox teamed up with New Orleans jazz singer Ledisi and indie popsters Lucius for the iconic Mitchell masterpiece “Big Yellow Taxi.”

During the song, the crowd jumped to its feet and sang along, including Kirsten Hillman, Canada's ambassador to the US, one of countless dignitaries and U.S. lawmakers in the audience.

It ended with a flourish: all six singers went down to serenade Mitchell in the front row, with Carlile handing over her mic to let the guest of honour deliver the final part of her signature line: “They paved paradise/Put up a parking lot.”

Before the show, Graham Nash was asked which was his favourite Mitchell song: “the one I'm performing,” he said matter-of-factly.

“She's a national treasure,” said James Taylor.

It's just the latest star turn for the resurgent singer-songwriter, who wowed fans last summer with a surprise set alongside Carlile at the Newport Folk Festival, her first full-length public performance in more than 20 years.

That appearance rekindled her love for playing live music, culminating in plans for a sequel of sorts - Carlile has billed it as “Joni Jam 2” - this June at the Gorge Amphitheatre, an outdoor venue two hours east of Seattle.

She also attended in person in D.C. in December 2021 as she was publicly feted at the Kennedy Center Honors.

Mitchell, who divides her time between an acreage in B.C. and her home in the musical mecca of Laurel Canyon in Los Angeles, has been gradually recovering from a ruptured brain aneurysm she suffered in 2015.

Other stars on Wednesday's bill included two of Mitchell's former beaus, James Taylor and Graham Nash, as well as fellow Canadian Diana Krall and the legendary jazz pianist Herbie Hancock.

As a Gershwin prizewinner, Mitchell joins a select group of legendary singer-songwriters including Paul McCartney, Billy Joel, Stevie Wonder and Carole King.

Honourees are selected by the Library of Congress in consultation with previous recipients as well as outside experts, with artistic merit, achievements, musical influence and impact on audiences as the main criteria.

On Thursday, in keeping with long-standing tradition, Mitchell will sit down for an hour-long conversation with Librarian of Congress Carla Hayden in the library's cavernous Great Hall inside the Thomas Jefferson Building.

A taped broadcast of the Gershwin tribute concert is scheduled to air March 31 on PBS.

This report by The Canadian Press was first published March 1, 2023.