The StereoFidelics, based in Asheville, N.C., have performed in Spencer several times before, both at the Shaky Tree Cafe and at a house concert.
"We love Spencer," McGinley said. "Everyone was so sweet and welcoming the first time we came. We feel we owe it to them to come back."
The StereoFidelics describe their music as "indie funk rock," influenced by everyone from classic rock to contemporary artists like the Black Keys and Iron & Wine.
"We're White Stripes meets James Brown," McGinley said. "Really up-tempo, energetic and funky."
They played an acoustic show on Thursday, with only a violin and a guitar as accompaniment. They will play a full-music set on Friday night, which includes a drum set and a synth bass.
"When they strip their music down, they have such a connection to each other," Melisa Wallace, manager at Mae B, said. "They breathe together, and the audience gets that energy from them."
In addition to writing the music with her partner, Padgett, McGinley sews the dresses she wears onstage.
"I always struggled with what to wear on stage," she said. "What you wear defines your image, but I'm a weird size to fit and it's hard to find cool clothes on a musician's budget."
McGinley has made about 12 dresses in the past year and a half. She makes about two per tour, and retires them to her closet when the tour is finished.
McGinley and Padgett met outside of the music industry and formed a relationship "first as people."
"It's been really helpful to know each other outside of music," McGinley said. "That way, it's not the only thing we can connect on."
StereoFidelics will play at Mae B coffee shop on East 4th Street from 8-10 p.m.
The concert is come-and-go, with a free-will donation. All of the money donated will go straight to the band.
For more information, they can be found at http://www.stereof.com.