Library Director Ben Treat said the series will feature a different musical group each week.
"There's classical, jazz. The Retro Rockerz is a popular group here in Bangor and they're going to be performing late July. So there's a lot of different groups that are performing. But we, at least for several years if not every year, have kicked off with the Bangor Band," Treat said.
Treat said the concert series will be from 7-8 p.m. every Wednesday night. He said this week's concert was the only one this year that was scheduled for a Tuesday.