After touring the world with multiple bands, Island musician Stephen Hart is accustomed to performing in front of strangers. For him, taking new stages and greeting new audiences is just another day on the job.

On Friday, July 21, Mr. Hart will play for a community that he has known all of his life, and in support of a cause that is particularly dear to his heart. That night, Mr. Hart and his band Hart Music Man are playing a concert at the Old Whaling Church in Edgartown to raise funds for his niece, Sofia Hart, who needs a heart transplant.

“Financially, this is all I can really do to help out my niece,” said Mr. Hart. “And I’ll actually get to see people in the audience who are familiar faces.”

Sofia, 27, and her twin sister Olivia were both diagnosed with heart conditions that require transplants. Olivia received her new heart three years ago. Today, fully recovered, she works as an emergency medical technician in New Mexico.

Sofia now awaits her new heart, and is currently being treated at Massachusetts General Hospital in Boston.

“She’s being kept alive with a battery right now,” explained Mr. Hart. “But she seems to be in pretty good spirits, I’ve got to say.”

The Hart family hosted a fundraiser in 2015 at The Seafood Shanty in Edgartown to help pay for Olivia’s transplant. Now, Mr. Hart said that he is hoping to see Islanders step up once again for Sofia.

Mr. Hart recently returned to the Island from the West Indies, where he performed at the Bequia music festival. He said that playing music back in his hometown will be a refreshing change.

“I think there’ll just be such a strong sense of community,” he said.

Vineyard singer and musician Jodie Treloar Sampson will also perform at the concert.

“It will be uplifting music for your spirits,” said Mr. Hart. “Think Tom Petty meets Jackson Browne meets Greg Allman.”

The concert begins at 7:30 p.m. on July 21. Tickets can be purchased online or at the door for $35. For more information, visit ticketsource.