BATH — The gazebo is alive with the sound of music all summer, thanks to Main Street Bath’s Summer in the City concert series.

This year, the series is running concerts four nights of the week, so there’s no excuse not to make at least one. Live music will be played every Tuesday, Wednesday and Friday night at 7 p.m. at the gazebo in Library Park, and on Saturdays there will be concerts held at the Waterfront Park at 6 p.m.

Launched in 2001 by Main Street Bath, the summer concert series brings in musicians from far and near to put on free concerts in the city of Ships.

“The music was originally scheduled one night a week,” said John C. Marsh Jr., who schedules the music along with Kathy Downing. “It’s popularity eventually spread to four nights weekly with the addition of six Wednesday evenings starting July 18.”

The series began with the Bath Municipal Band playing Friday nights in the gazebo, and the Bath Municipal Swing Band playing Tuesday nights in the gazebo. Since then the summer concert series has expanded to include more musical acts and more days of music throughout the summer. Most of the acts, such as the Nor’easters Barbershop, Maine Pops Concert Band and the Merrymeeting Community Band are local, although out of state acts aren’t unheard of.

“I like the fact that most of the musicians are local, although last week we had the (National Guard Band of the Northeast) come up from Philadelphia,” said Marsh. “But they offered. They were free. And they were very, very good.”

With a budget of just about $4,000 a year, Marsh said the concert series is dependent on 24 sponsors to continue bringing in concerts every year.

“We don’t have a huge budget, so a number of the bands play for free and some of them have a small stipend that they get paid,” said Marsh.

But even in their 18th year, Marsh said the concerts continue to grow in popularity.

“This is the first year that we’ve done the Wednesday night. What’s popular is the desire for the musicians to be heard. I was getting calls from musicians wanting to play and there was no room to fit them in so I thought we’d add another night,” said Marsh.

The Wednesday night concerts will take place in either Library Park or Waterfront Park depending on the week. In addition, the summer concert series is collaborating with the Chocolate Church, which is producing a number of musical concerts Saturday nights at Waterfront Park.

“The Waterfront Park on Saturday nights was started by the Chocolate Church and it was designed pretty much to bring people into town and stay for dinner,” said Marsh.

For Marsh, the concert series is just another thing that makes Bath special.

“I think music is all around important, period. Music four or more nights a week — some people might think it’s too much, but I don’t think it’s too much,” said Marsh. “Just to have music, just to have something in town for people to come and listen to … I can’t think of a better word for that than uplifting.”

“To have this type of musical atmosphere in the city of Bath is just one more piece that makes Bath a better place to live and work,” he added.