The performance will include pieces from the chorus' 50 year history.
The chorus was formed in 1959 when members of a local theater group decided they wanted to sing together more often.
"I think it's just comradery and the feeling of family," said Stacy George, who has been a member of the choir for at least 15 years. "I have my father and sister singing with me, but the group itself, we're just a big huge family."
George's father, Lloyd George, is 85 and one of the chorus' founding members. He still sings with the group when he's able.
Stacy's sister, Linette, says she first sang with the group when she was 12.
"I have very fond memories of the first time I sang and I have continued to sing after that," Linette George, who has been a member of the chorus for around 10 years, said. "I just think its a wonderful experience and I'm happy to be a part."
The newest member of the group just moved to Bangor and said the group has been welcoming.
"What I would say to anybody interested in music is that it's a no pressure thing," said Karen Champeon, the chorus' newest member, who has been singing with them for a year. "You don't have to try out. Come join us. It's a blast."
The celebratory performance will be held on April 28th at the First United Methodist Church in Bangor at 4 p.m.