In the five years since rising young all-female rock band Plush debuted with a self-titled album that gave it two Top 40 Mainstream Rock chart hits, the group has grown and changed, singer Moriah Formica says.

Some of the biggest changes are reflected in the band’s new album, “Mass Hysteria,” released Sept. 18, Formica says.

The disc is “by far the heaviest album that we’ve ever put out, and the heaviest work that we’ve ever done so far,” she says.

Since its debut disc, Plush also released the 2023 EP “Find the Beautiful,” which also produced two Top 40 Mainstream Rock hits.

Plush will show off some of those musical changes, as well as the fact that it’s now a trio instead of a foursome, when the group plays at 6 p.m. Sept. 25. Gin Mill and Grill, 1750 Main St., Northampton.

“‘Mass Hysteria,’ I guess, … goes through a kind of a journey of different emotions,” Formica says in a phone interview from a tour stop in Shreveport, La. “I guess primarily rage being a big one of them.

“I think the experiences we’ve all had together as a band, and everything we went through, has really been shown in what we’ve made in this album,” she says.

“It definitely is part of our evolution. I think it’s much more true and genuine to who we are as people now.

“Because when we started this thing, we were all so young ... I mean, some of us were fresh out of high school.

“And, you know, a lot changes over the years, especially doing this, because I feel, like, you grow and evolve and mature much more quickly in this business than not. And as a result, your sound does, too.”

Formica, at age 16 in 2017, became one of the youngest competitors in the history of the NBC-TV singing competition show “The Voice” to have all four judges turn their chairs for her.

She was eliminated from the show before the Top 12 were chosen, but through the coronavirus pandemic, Formica released cover versions of rock songs, with several getting millions of views. One of those, Heart’s “Barracuda,” got 7 million views on two of the band’s social media platforms.

The first album produced the hits “Hate” and “Left Behind,” and the EP gave them “Left Behind” and “Run.”

The band has toured with the platinum-selling chart-topping metal band Disturbed and opened for KISS, Bush, Breaking Benjamin, Alice in Chains and Evanescence.

Another big change in Plush’s development was that shortly before the band recorded “Mass Hysteria,” guitarist Bella Perron left the band. Perron has since self-released two singles and reportedly is working on a solo album.

The remaining members of Plush in the interview decline to talk more about Perron’s departure.

“We don’t really know,” Formica says. “That’s kind of it.”

Some things about the new album, perhaps that rage that Formica mentioned, could be interpreted in connection to the fallout.

“I will say it definitely was a little nerve-wracking,” Formica says. “It was, like, actually a lot nerve-wracking at first, because it’s like, ‘Dude, OK, now this happened. Now we got two weeks until our freaking tour, you know?’ So there was a lot of kind of rearranging stuff.”

The most recent single, “Animalistic,” written with Zach Malloy and Blair Daly of Four Horsemen, based in Nashville, came together when the band “got together and started talking about just where our heads were at, what do we want to convey right now? What are we feeling lately? I guess as you do in a songwriting session,” Formica says.

“And one of the biggest points that I was feeling at the time was just a lot of rage, but also kind of forgetting that at the end of the day we’re so primal, like being caught up.

“Obviously, yes, we’re human. We have many, many ranges of emotions, but I think it’s easy to get caught up and forget that at the end of the day we have these primal visceral reactions to things.”

Overall, though, Plush’s remaining members say they found working in the studio as a trio invigorating.

“I think that definitely this time, we went into the studio with much more of a vision: the direction that we wanted to go,” Formica says. “And the writing, I think, is a lot more mature, for sure. You know, lyrically, melody-wise, music, like all of it.

“I think that you can just really hear our growth since the first album. I mean, in my opinion, it’s kind of night and day.”

Drummer Faith Powell agrees.

“I think it shows how much maturity - people and experiences - we’ve been through has really brought us this point to only getting music that we love so much,” Powell says.

“It’s our work I’m proudest of, because it feels much more united, too. I think that comes across just from listening to the album,” says Powell.

That growth also is true for the band as a whole, Formica says.

“I think that the energy is just much more pure,” she says. “There’s just more energy to begin with, period, I think, on stage and in the studio.

“I loved being in the studio this time around because it was, first of all, so funny. There’s like so many funny stories that I feel like I can say, and I think the process was much more collaborative, too, which was really nice.

“And I also just think that we’re, like I said earlier, I think we’re much more genuine, authentic versions of ourselves as a trio, for sure.

“I think even outside the band, we’re all just super close with each other, so everything just feels so natural because we’re best friends and sisters to begin with. So everything just, like, comes naturally with the chemistry on stage, too.

“I just feel like it just shows that energy, and I think the crowds can see that, too.”

Now a few years into its journey, Plush even has memories of earlier stops.

Bassist Ashley Suppa says she remembers Plush playing Allentown’s former Maingate Nightclub the last time they were on tour in 2024.

“I love Pennsylvania,” Suppa says. “I remember the food being so good, and all like there’s a farmers’ market [Allentown Farmers Market, adjacent to Maingate] we went to last time.

“Before we went to sound check, we checked out the farmers’ market, got some really good food, and the people are so nice there. So we’re so excited to come back in the area.”

When Plush started, its stated goal was that it was “dedicated to bringing rock music back to the forefront of the industry.”

“Well, you know, I do think that when we started, like I said, we were very young, and you have big, big dreams,” Formica says now.

“How that would look to us, I think, has really evolved throughout the years. Because I think instead of this one big mission statement, now to us, it’s kind of become working toward that. Now it’s become kind of any sort of effort to keep rock going and to keep rock alive.

“Because it’s back. It’s here. Not that it ever went away, it’s now it’s really back. Like even from when we started, it’s really come back, I think, and I think it’s a collective thing of many bands and younger bands and women, women-fronted bands, all-women bands.

“I think it’s a collective thing of all of us coming together, putting out music, and kind of trying to carry the torch for this new generation of rock.”

Plush information, tickets: https://plushrocks.net/