NILES — Jamie Miller’s life revolves around his three jobs, but he loves it. He is a member of the Whistle Pigs, a seven-piece brass band. He co-founded and still plays in High Life, a classic rock band. He has also been on what he calls a constant tour with the musical Granger-based trio the Whateverly Brothers.

The well-being of the Michiana’s dog and cat population partially revolves around the jobs of South Bend’s Pet Rescue ABC Clinic staff. Since 2011, they have spayed and neutered 70,000 cats and dogs in the Michiana area.

This Thursday, the two northern Indiana groups will perform and promote themselves respectively at 6 p.m. Thursday during the Niles Summer Concert series at the Riverfront Park amphitheater.

Miller said all members of the Whateverly Brothers are animal lovers — he said bassist Craig Schroeder’s home is so full of animals, it is like “a zoo.”

That is why they chose ABC Clinic as the nonprofit to be present as they play forgotten classic songs and one-hit wonders to Thursday’s crowd.

It is the second year the two groups have partnered for the Niles Summer Concert Series.

ABC Clinic offers reduced-rate spay and neutering services to animal shelters, animal rescues and owners of cats and dogs. The reduced rates are made possible by its nonprofit status, which lowers the price of its procedures that prevent cat and dogs from having reproductive capabilities.

“We understand that people of all [income] brackets want to enjoy pets and have companionship, so we feel like it’s super important for them to have this option,” said Kim Landis, lead veterinarian assistant and surgery assistant at ABC Clinic.

Landis said that pet overpopulation is a problem across the nation, and Michiana is no exception.

“It’s very unfortunate,” she said. “The euthanasia rates are very reflective of that problem. People across the board are having a hard time with open or closed admission shelters that are just very overpopulated and then are faced with a very hard decision to make.”

She said overpopulation can place a burden on pet owner, increase feral animal rates and sets newborn animals up for unhealthy lives. That is where spay and neutering comes in.

At Thursday’s concert, ABC Clinic will provide information about its services, which also include vaccinations, feline leukemia tests and heartworm tests.

Those unable to attend the concert but who want to set up an appointment with the nonprofit can call (574) 291-7729, Landis said.

Above ABC Clinic on the amphitheater stage, the Whateverly Brothers’ members will strum guitars, pluck a bass and sing in harmonies.

The harmonies are what led to the formation of group, Miller said. The three were all part of High Life, but when Schroeder and guitarist Mike Smith left, the three began to miss singing together.

“I loved singing with Mike and Craig,” Miller said. “These guys. Their harmonies are dead on, and that’s what kind of launched High Life to where it is today.”

On Thursday, the trio will perform at what Miller considers to be a favorite venue type: concert series.

He said he used to play at clubs, — back when he could make it through the late night and early morning without tiring — but people never truly listened to the music. They just danced.

Now, the Michiana music scene is centered around breweries and wineries, said Miller, which he likes more.

The place where the crowd is most in-tune with the band, however, are concert series like Niles’.

“People are there primarily to listen to us,” he said. “It puts what you’re doing under a microscope, and we can concentrate on the harmonies, the sound system, the effects of the vocals.”

Tomorrow, the three will sing and play songs that have been largely forgotten, Miller said. When listeners hear the songs, however, many remember the words and the melody.

The effect it creates is wonderful to see, he said.

“The radio stations, they play oldies or classics, but they don’t play all the songs people still remember. They have an algorithm,” Miller said. “We pull stuff that a lot of people haven’t heard in a long time.”