As Acute Inflections, vocalist Elasea Douglas and upright bassist Sadiki Pierre range across many genres.

Acute Inflection performs “Soulful Sounds,” Dec. 19, Da Vinci Science Center, Allentown. The concert is sold out.

“There is a jazz influence in almost everything we do, but we also cover R&B, Afrobeat, reggae and rock,” says Pierre.

Douglas says one thing is consistent:

“We never do the songs the way they are originally done.”

The duo, which formed 13 years ago, combines elegance with an informal closeness for audiences.

Pierre’s combination of melody and percussiveness in his bass playing provides a full backing for Douglas, who brings out emotion in each song.

They often mingle with the audience before they go on stage to ask what music people want to hear, or they take requests on social media.

Douglas has a seemingly endless supply of beautiful clothes from a closet she describes as “bursting from the seams.”

During their first 10 years, the duo did private functions such as weddings and corporate events where they built their set list.

“We would get song requests and keep the ones that took,” says Douglas in a phone interview from their home in New York City.

“We look at what the song wants to say and what it feels. We do it differently, in a way that interprets the words with the music,” Douglas says.

They have begun to play more originals. Pierre says that familiar songs let people get accustomed to their unusual style. With an expanding following of fans, he says they have a “unique cosmic connection and energy.”

According to Pierre, “Soulful Sounds” is inspired by the Harlem Renaissance, which he describes as a “cultural movement that combined music, civil rights and intellectual discussions from the first part of the 20th century.

“It is not a reenactment show, but an interactive evening of music, comedy, storytelling and an inspirational message,” he says.

Acute Inflections has performed four times at Musikfest, at Allentown Brew Works, and the Inkwell in Allentown.

Douglas has been singing since childhood. Pierre did not play music professionally until they met. Douglas reminisces that the first time Pierre saw her perform, he told a friend, “I need to be in her life.”

One night when Pierre was ready to back up Douglas onstage, the rest of the band did not show up. Despite their misgivings, the audience loved the duo, and it led to further bookings.

They have recorded five albums, including the Christmas collection, “In December,” and “400 Years,” with the latter including Bob Marley covers. A new CD is expected to be available next year at their website: www.acuteinflections.com

Proceeds from the Da Vinci concert benefit Renaissance Youth Center, South Bronx, which provides music education, after-school programs and tutoring. Douglas, who grew up in Queens, says the center has made a difference in the last 25 years.

“Soulful Sounds,” Acute Inflections, 7 p.m. Dec. 19, DaVinci Science Center at PPL Pavilion, 815 Hamilton St.. Allentown. www.davincisciencecenter.org