In a recent interview, musicians Bela Fleck and Abigail Washburn said that ever since their new baby was born the only real moment they have alone to themselves is when they are on stage. Such is the life of new parents everywhere, and perhaps especially so for a husband and wife musician team nearly always on the road.

But on Wednesday night at the Performing Arts Center at the regional high school the couple was definitely not alone. The crowd was a near sell-out, and many commented that it looked like a town meeting, with a broad spectrum of Islanders of all ages in attendance.

“But with a lot more smiling,” someone said.

In fact, the West Tisbury town meeting, which had spilled over to two days, did not get a quorum because so many residents of that town had gone to the show.

Mr. Fleck has won 15 Grammy Awards. — Maria Thibodeau

It was crowded on stage, too — the musicians heavily outnumbered by banjos of many different shapes and sizes.

Ms. Washburn uses a distinct clawhammer banjo style, a particularly rough sounding name for such a beautiful sound. And then there is her voice, the product of a bit of double dealing for sure — selling her soul to both the angel and the devil. True story. Honest.

Mr. Fleck is a virtuoso of the banjo, there really is no other way to describe him.

“There are some people here who are realizing with horror that all they are going to hear tonight are banjos,” Mr. Fleck said to the crowd, a few songs into the show. Horror was the last thing on anyone’s mind — except perhaps during Ms. Washburn’s murder ballad.

The concert was produced by TPS presents, also known as Phil daRosa. Proceeds from the show went to The Island Collaborative, a relatively new nonprofit on the Island dedicated to the muse of collaboration to help the arts community succeed. All profits from the sale of merchandise went to Island Grown Schools.

The musicians also gave away a ukulele banjo, won by a 10-year-old girl from Edgartown.

The duo said they had arrived on the Island a few days before the show and made the most of their time here. In between songs, the couple talked to the crowd as if everyone was already a friend, and in fact many were new friends. During the past few days they had met members of the ukulele club at Black Sheep in Edgartown, got the lowdown on Island Grown Schools from Noli Taylor, and even heard about Bob Carroll, the patriarch of the Harbor View, where they were staying. Mr. Carroll’s grandson Patrick Joyce was working the monitors at the concert. Ms. Washburn dedicated a song to the late Mr. Carroll.

Ms. Washburn sang a folk song in fluent Chinese. — Maria Thibodeau

The show spent time in the deep south, playing many songs from the 1930s, recorded for posterity by the folklorist Alan Lomax when he was touring there to preserve the music of a particular time and place. It travelled to Chicago, Appalachia and even China, with Ms. Washburn singing a folk song in fluent Chinese that she had learned from “Old Lady Wong.” Mr. Fleck told the crowd that Ms. Washburn had been studying Chinese for 18 years.

Ms. Washburn did some tap dancing during one song, and then during another song she sprouted wings and flew around the auditorium. Okay, that last detail is a stretch, but not by much. The woman could do just about anything it seemed.

The evening alternated between duets, with both players on various banjos and Ms. Washburn singing, to solos. While one played, whether it was Mr. Fleck perched on a bar stool with a ukulele banjo or Ms. Washburn standing at the microphone, the other watched in rapt attention. In between songs, they told stories about each other, bragging about their partner in a way you wished all couples did.

One song was a tribute to the elder generation of banjo players, many of whom are dying off. Earl Scruggs, who many consider the best banjo player ever, died in March of 2012, and Doc Watson died in May of that same year. Ms. Washburn sang a song that was performed at Doc’s memorial service. She also dedicated a song to her grandmother, June, who first encouraged the couple to play together, and for whom their baby Juno is named.

And near the end of the show, they led the crowd in a sing-a-long, with the whole auditorium helping with the chorus that went like this:

Here it Ring, Hear it Ring, All the Joy, All the Joy, That it Brings, That it Brings.

Amen to that.