About 15,000 people attended the Oak Harbor Music Festival last year, doubling attendance from the year before.

The festival kicks off its fourth year Friday with performances scheduled through Sunday on two main stages at opposite ends of Pioneer Way in historic downtown.

Thirty-two bands are slated to perform during the three-day event, with music ranging from country to rhythm and blues to bluegrass yet is heavy with rock.

Some of the most popular groups and performers from last year are returning, namely The Beatniks, The Fame Riot, The Robbie Walden Band and Dylan Jakobsen.

“Everybody was bugging me to get the Beatniks back,” said organizer Larry Mason, himself a musician.

The rest of the band lineup is largely different than 2014 with some performing in previous years.

The headliner is Los Angeles band Lukas Nelson & the Promise of the Real at 9:30 p.m. Saturday. Nelson is the son of music legend Willie Nelson.

The music festival has teamed up with another nonprofit, the Melodic Caring Project, to stream Lukas Nelson’s show to children in their hospital rooms, said event organizer Cynthia Mason.

Other performers include Spokane-based rock band Too Slim and the Taildraggers and Rust on the Rails, a relatively new Seattle band.

The Kalimba Band, an Earth, Wind & Fire tribute band, will get the crowd “up and jumping,” Larry Mason said.

Another band he’s excited about is Jelly Bread, a rock band from Reno, Nev.

“There are a lot of new ones that are really fun,” said Margaret Livermore, president of the Oak Harbor Music Festival.

The festival continues from 11 a.m. to 11 p.m., Saturday, Sept. 5, and 11 a.m. to 8 p.m., Sunday, Sept. 6.

More information about the music festival may be found at www.oakharborfestival.com