At a glance

It’s like looking into a mirror: If Megan Mullally makes a mistake onstage, her reflection stumbles right back.

Her spitting image is Stephanie Hunt, who can tell when a beat is off and adjusts her pace accordingly.

Mullally (Karen Walker on “Will & Grace” for the above-30 crowd; Tammy II on “Parks and Recreation” for the younger set) and Hunt (who appeared briefly on “Friday Night Lights”) together form the quirky, vaudeville-esque duo Nancy and Beth.

The two acknowledge that they do their best to remain perfectly in sync throughout the revue, but nobody’s perfect.

“If we get through a show where we haven’t made 29 mistakes, we’re like ‘We killed it,’” said Mullally, 58. Nancy and Beth (part of “Ovation: A Concert Gala”) Southern Theatre, 21 E. Main St. 1-800-745-3000, www.ticketmaster.com 7 tonight $68 to $100

Their summer circuit stops at two Pride festivals, including a benefit for Stonewall Columbus tonight at Southern Theatre.

Their wide-ranging catalog of songs spans the sultry Wynona Carr blues number “Please Mr. Jailer” and Gucci Mane rap track “I Don’t Love Her.”

At first glance, the 30-year age gap between the actresses might attribute to the breadth of music choices, but they come across more as best pals than teacher and student.

“That’s the magic of it,” Hunt, 28, said. “I feel like we’re the same age or that age doesn’t really exist, and I feel that’s what people get from our relationship.”

At a recent show at Royal Festival Hall in London, a friend told Mullally that their dynamic seemed to be one of complete trust.

“I thought that was so amazing,” Mullally said. “I’ve never had one millisecond of thinking anything askance about Stephanie, ever.”

A chance meeting on the set of the independent film “Somebody Up There Likes Me” in 2012 immediately connected the actresses.

Hunt hopped in a rental car with Mullally on the last day of filming and started strumming her ukelele. It only took one duet for Nancy and Beth to develop into a full-fledged concept.

Only in the past year or so, though, have they gained traction among music fans and national media outlets.

The April debut of their self-titled album kicked Mullally and Hunt into gear, and this summer they’ll play a slew of festivals and shows, including at the Grand Ole Opry in Nashville, Tennessee; the Newport (Rhode Island) Folk Festival; and the Solid Sound Fest in North Adams, Massachusetts.

Each location caters to a widely varying genre, none of which fit neatly into the Nancy and Beth sound — probably because that sound is impossible to classify.

“We’ve tried describing it as punk-vaudeville, but I don’t know how to describe it, really,” Mullally said. “It’s entertaining. I guess that’s obvious, but sometimes don’t you hear a band (before) and hear four songs and you’re completely bored? In our

dream world, if we were going out to see a band, what would we want to see? And that’s what this is.”

“We’re not thinking about framing it or what’s marketable,” Hunt said. “We just do it.”

Despite a broad audience base, Mullally and Hunt have noticed particular interest from the LGBTQ community.

“Something we’ve

been commenting on recently is we’re not really sexualizing ourselves, but it’s a sexy show,” Hunt said. “We’re not gendering ourselves.”

Finishing Hunt’s sentence — as the friends admit they often do — Mullally added that seriousness ranks low on their entertainment objectives.

“It’s genderless but it’s also irreverent,” she said. “We did whatever we want, and that has its own appeal.”

Skirting the line

between funny and flippant doesn’t seem to be an issue for Nancy and Beth.

Aside from their precise choreography — Mullally attended the School of American Ballet — the two don’t hammer out specifics, whether dialogue or singing.

Calling Hunt “a harmony savant,” Mullally said she takes the melody and Hunt instinctively knows how to blend her voice.

The show mixes in multiple elements — comedy, vocals, dancing and zany props — but Hunt and Mullally agreed the music comes first.

“We sincerely have these songs that we love to do,” Hunt said. “Even if it’s silly, it’s never just for a joke.”

“I think that’s one of the secrets of our success,” Mullally said. “We really do love all the music so much; we’re really passionate about it. It really spurs us on."